Question 1

Classification – Ordered pairs (constant fraction rule): in three pairs the mapping is y = (3/4) * x exactly; one pair follows a different ratio. Identify the odd one out.  Options: 96 : 80, 64 : 48, 80 : 60, 104 : 78.

Accepted Answer

Introduction / Context: Ratio-based pair classification checks whether a consistent multiplicative factor maps x to y. Any deviation indicates the outlier. Given Data / Assumptions: Test y = (3/4) * x for each pair. (64,48): 64*(3/4)=48 ✔ (80,60): 80*(3/4)=60 ✔ (104,78): 104*(3/4)=78 ✔ (96,80): 96*(3/4)=72 ≠ 80 ✖ Concept / Approach: Use an exact fractional check (no rounding). The three compliant pairs share the same fraction 3/4; the remaining pair does not. Step-by-Step Solution: Compute (3/4)*x for each pair and compare to y.Mark the mismatch as the odd one out. Verification / Alternative check: Reduce y:x to lowest terms: 48:64=3:4, 60:80=3:4, 78:104=3:4, while 80:96=5:6. Why Other Options Are Wrong: 64:48, 80:60, 104:78: All obey the same 3/4 ratio. Common Pitfalls: Accepting near-equality; proportional rules require exact equality in these puzzles. Final Answer: 96 : 80

Question 2

Classification – Number pairs (square-difference test): in three pairs the difference (first − second) is a perfect square; one pair has a non-square difference. Find the odd one out.  Options: 61 - 12, 34 - 30, 44 - 31, 25 - 21.

Accepted Answer

Introduction / Context: Pair-difference classification often checks whether differences land on special sets (e.g., perfect squares). A single miss identifies the outlier. Given Data / Assumptions: 61 − 12 = 49 = 7^2 → square. 34 − 30 = 4 = 2^2 → square. 25 − 21 = 4 = 2^2 → square. 44 − 31 = 13 → not a perfect square. Concept / Approach: Compute the difference of each pair and test for perfect-square status. Step-by-Step Solution: Calculate each difference.Mark square vs non-square results.Identify the pair whose difference is not square. Verification / Alternative check: Nearest squares around 13 are 9 and 16; 13 is not square, confirming the exception. Why Other Options Are Wrong: 61−12, 34−30, 25−21: Each yields a perfect square difference and thus belongs together. Common Pitfalls: Miscomputing 61−12 as 51; the correct result is 49. Final Answer: 44 - 31

Question 3

Classification – Letter sequences (final step direction): in three sequences all steps move backward through the alphabet; in one sequence the last step reverses direction forward. Find the odd one out.  Options: T P L I, R N J F, S O K L, Y U Q M.

Accepted Answer

Introduction / Context: Multi-letter sequences often use constant backward jumps. Anomalies typically flip direction or alter the step size at the end. Given Data / Assumptions: T→P (−4), P→L (−4), L→I (−3) → all backward. R→N (−4), N→J (−4), J→F (−4) → all backward. Y→U (−4), U→Q (−4), Q→M (−4) → all backward. S→O (−4), O→K (−4), K→L (+1) → final step forward. Concept / Approach: Check the direction of each step. Three sequences maintain backward movement throughout; one reverses to a forward step at the end. Step-by-Step Solution: Compute successive differences for each sequence.Flag the single case with a positive final step. Verification / Alternative check: Even if some sequences change the magnitude (−3 vs −4), only one changes the sign from negative to positive at the end. Why Other Options Are Wrong: T P L I, R N J F, Y U Q M: Each maintains backward-only movement across all steps. Common Pitfalls: Counting inclusively or misreading letter positions near the ends of the alphabet. Final Answer: S O K L

Question 4

Classification – Unscramble each group to a meaningful English word, then find the odd one out based on semantic category (numbers vs operation).  Scrambles: GHIET, VEENS, VIDEID, ORFU.

Accepted Answer

Introduction / Context: Some verbal items combine anagramming with categorization. After unscrambling, three words belong to a single semantic class, and one falls outside it. Given Data / Assumptions: GHIET → EIGHT (number). VEENS → SEVEN (number). ORFU → FOUR (number). VIDEID → DIVIDE (arithmetic operation, not a number name). Concept / Approach: First, correctly unscramble each option. Then, group by semantic category: number names versus arithmetic operations. Step-by-Step Solution: Unscramble all four.Classify EIGHT/SEVEN/FOUR as number names.Classify DIVIDE as an operation.Select the operation as the odd one. Verification / Alternative check: Confirm each anagram via common word lists; only DIVIDE is not a cardinal number word. Why Other Options Are Wrong: GHIET/VEENS/ORFU: Each unscrambles to a cardinal number term and thus forms the majority class. Common Pitfalls: Mis-anagramming “VIDEID” as “DEVISED”; the exact letters yield DIVIDE. Final Answer: VIDEID

Question 5

Classification – Pairs of numbers (perfect squares): three pairs are both perfect squares; one pair contains non-square numbers. Identify the odd one out.  Options: 8 - 15, 25 - 36, 49 - 64, 81 - 100.

Accepted Answer

Introduction / Context: Square-number recognition is a common classification basis. When pairs are given, the test may require both members to be perfect squares. Given Data / Assumptions: 25 and 36 are 5^2 and 6^2. 49 and 64 are 7^2 and 8^2. 81 and 100 are 9^2 and 10^2. 8 and 15 are not perfect squares. Concept / Approach: Check square status of each number in every pair. The pair that fails the “both squares” rule is the outlier. Step-by-Step Solution: Verify 25–36 → both squares.Verify 49–64 → both squares.Verify 81–100 → both squares.Check 8–15 → neither is a square. Verification / Alternative check: Locate each value between consecutive squares: 8 is between 2^2 and 3^2; 15 is between 3^2 and 4^2. Why Other Options Are Wrong: 25–36, 49–64, 81–100: Each pair consists entirely of perfect squares. Common Pitfalls: Confusing 16 (a square) with 15; careful reading avoids this slip. Final Answer: 8 - 15

Question 6

Classification – Four-digit numbers (first equals last): in three numbers the first and last digits are equal; one number breaks this symmetry. Find the odd one out.  Options: 3463, 5725, 6514, 8948.

Accepted Answer

Introduction / Context: Digit-pattern classifications frequently check positional symmetry. A simple equality between first and last digits can define the majority pattern. Given Data / Assumptions: 3463 → first digit 3, last digit 3 → equal. 5725 → 5 and 5 → equal. 8948 → 8 and 8 → equal. 6514 → 6 and 4 → not equal. Concept / Approach: Test first–last digit equality for each number and select the one that fails. Step-by-Step Solution: Mark 3463, 5725, 8948 as symmetric at ends.Mark 6514 as asymmetric at ends.Therefore, 6514 is the odd one out. Verification / Alternative check: Read digits carefully; the center digits are irrelevant in this rule. Why Other Options Are Wrong: 3463/5725/8948: Each satisfies the first=last rule. Common Pitfalls: Accidentally checking first=second or other non-specified comparisons; the rule concerns the extreme positions only. Final Answer: 6514

Question 7

Classification – Political designations: three are executive/government office titles; one is a designation for a member of a legislature. Identify the odd one out.  Options: M.L.A., Prime Minister, President, Minister.

Accepted Answer

Introduction / Context: Civics classifications often separate executive offices from legislative roles. Identifying which label refers to a legislator distinguishes the outlier. Given Data / Assumptions: M.L.A. → Member of Legislative Assembly (legislator). Prime Minister → head of government (executive). President → head of state (executive/constitutional office). Minister → member of the executive (cabinet/portfolio holder). Concept / Approach: Group by branch: legislative role versus executive offices. Step-by-Step Solution: Tag Prime Minister/President/Minister as executive titles.Tag M.L.A. as a legislator.Hence, M.L.A. is the odd one out. Verification / Alternative check: Basic government-structure references confirm the separation of powers/roles. Why Other Options Are Wrong: Prime Minister/President/Minister: All are executive branch positions. Common Pitfalls: Assuming “Minister” could be religious; in this civic context it denotes a governmental executive office. Final Answer: M.L.A.

Question 8

Classification – Perfect squares: three numbers are exact squares; one is not a perfect square. Which is the odd one out?  Options: 49, 36, 65, 100.

Accepted Answer

Introduction / Context: Square recognition is foundational in numerical classification. A single non-square among well-known squares is the intended outlier. Given Data / Assumptions: 49 = 7^2. 36 = 6^2. 100 = 10^2. 65 is between 8^2=64 and 9^2=81 → not a square. Concept / Approach: Check each value against nearby integer squares or factorization to confirm square status. Step-by-Step Solution: Verify 49, 36, 100 as squares.Recognize 65 is not an exact square. Verification / Alternative check: Prime factorization: 65 = 5 * 13 contains no repeated prime factors, hence not a square. Why Other Options Are Wrong: 49/36/100: Each is a perfect square and forms the majority class. Common Pitfalls: Confusing 64 (square) with 65 due to adjacency. Final Answer: 65

Question 9

Classification – Animal classes/habitats: three are mammals; one is an insect. Identify the odd one out.  Options: Langur, Whale, Scarab, Donkey.

Accepted Answer

Introduction / Context: Biological classification can separate options by class. Mammals share key traits distinct from insects, making the outlier easy to spot. Given Data / Assumptions: Langur: primate (mammal). Whale: marine mammal. Donkey: equid (mammal). Scarab: beetle (insect). Concept / Approach: Group by biological class: Mammalia versus Insecta. Step-by-Step Solution: Identify Langur/Whale/Donkey as mammals.Identify Scarab as an insect.Therefore, Scarab is the odd one out. Verification / Alternative check: Taxonomic references confirm whales, langurs, and donkeys are mammals; scarabs are coleopteran insects. Why Other Options Are Wrong: Langur/Whale/Donkey: All belong to class Mammalia. Common Pitfalls: Assuming “whale” is a fish due to habitat; it is a mammal. Final Answer: Scarab

Question 10

Classification – Perfect squares vs non-square: three numbers are perfect squares; one is not. Which is the odd one out?  Options: 210, 529, 289, 196.

Accepted Answer

Introduction / Context: One common numeric contrast is square versus non-square. Recognizing classic square values isolates the outlier quickly. Given Data / Assumptions: 529 = 23^2. 289 = 17^2. 196 = 14^2. 210 is not a perfect square; it lies between 14^2=196 and 15^2=225. Concept / Approach: Confirm square status via known squares or factorization. Step-by-Step Solution: Mark 529, 289, 196 as squares.Mark 210 as non-square.Select 210 as the odd one out. Verification / Alternative check: Prime factorization of 210 = 2 * 3 * 5 * 7 includes no repeated prime factors, so it cannot be a square. Why Other Options Are Wrong: 529/289/196: Each is exactly n^2 for integer n. Common Pitfalls: Mistaking 225 (15^2) for 210; the latter is not square. Final Answer: 210

Classification Questions