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- Question
2, 15, 4, 12, 6, 7,?,?
Options- A. 8, 8
- B. 8, 0
- C. 3, 8
- D. None of these
- Correct Answer
- 8, 0
ExplanationLet the missing terms of the series be x1 and x2.Thus, the sequence 2, 15, 4, 12, 6, 7, x1 x2 is a combination of two series :
I. 2, 4, 6, x1 and II. 15, 12, 7, x2I consists of consecutive even numbers.
So, missing term, x1 = 8.
The pattern in II is - 3, - 5,......So, missing term, x2 = 7 - 7 = 0.
Series Completion problems
Search Results
- 1. 1, 1, 2, 6, 24,?, 720
Options- A. 100
- B. 104
- C. 108
- D. 120 Discuss
Correct Answer: 120
Explanation:
The pattern is x 1, x 2, x 3, x 4,.....So, missing term = 24 x 5 = 120.
- 2. On Children's Day, sweets were to be equally distributed among 175 children in a school. Actually on the Children's Day, 35 children were absent and therefore each child got 4 sweets extra. Total how many sweets were available for distribution?
Options- A. 2400
- B. 2480
- C. 2680
- D. 2800 Discuss
Correct Answer: 2800
Explanation:
- 3. In a family, a couple has a son and a daughter. The age of the father is three times that of his daughter and the age of the son is half of that of his mother. The wife is 9 years younger to her husband and the brother is seven years older than his sister. What is the age of the mother?
Options- A. 40 years
- B. 45 years
- C. 50 years
- D. 60 years Discuss
Correct Answer: 60 years
Explanation:
Let the daughter's age be x years.Then, father's age = (3x) years.
Mother's age = (3x - 9) years; Son's age = (x + 7) years.
So, x + 7 = (3x-9)/2 ⟺ 2x + 14 = 3x - 9 ⟺ x = 23.
Therefore Mother's age = (3X - 9) = (69 - 9) years = 60 years.
- 4. A student got twice as many sums wrong as he got right. If he attempted 48 sums in all, how many did he solve correctly?
Options- A. 12
- B. 16
- C. 18
- D. 24 Discuss
Correct Answer: 16
Explanation:
Suppose the boy got x sums right and 2x sums wrong.Then, x + 2x = 48 ⟺ 3x = 48 ⟺ x = 16.
- 5. Nitin's age was equal to square of some number last year and the following year it would be cube of a number. If again Nitin's age has to be equal to the cube of some number, then for how long he will have to wait?
Options- A. 10 years
- B. 38 years
- C. 39 years
- D. 64 years Discuss
Correct Answer: 38 years
Explanation:
Clearly, we have to first find two numbers whose difference is 2 and of which the smaller one is a perfect square and the bigger one a perfect cube.Such numbers are 25 and 27.
Thus, Nitin is now 26 years old. Since the next perfect cube after 27 is 64,
so required time period = (64 - 26) years = 38 years.
- 6. 4832, 5840, 6848,?
Options- A. 7815
- B. 7846
- C. 7856
- D. 7887 Discuss
Correct Answer: 7856
Explanation:
The pattern is + 1008.So, missing term - 6848 + 1008 = 7856.
- 7. 5824, 5242,?, 4247, 3823
Options- A. 4467
- B. 4718
- C. 4856
- D. 5164 Discuss
Correct Answer: 4718
Explanation:
Each term in the series is obtained by subtracting from the preceding term the numberformed by the first three digits of the preceding term.
So, missing term = 5242 - 524 = 4718.
- 8. 2, 8, 16, 128,?
Options- A. 2042
- B. 2046
- C. 2048
- D. 2056 Discuss
Correct Answer: 2048
Explanation:
Each term in the series, except the first two terms, is the product of the preceding two terms.So, missing term = 16 x 128 = 2048.
- 9. 1, 2, 6, 7, 21, 22, 66, 67,?
Options- A. 70
- B. 134
- C. 201
- D. 301 Discuss
Correct Answer: 201
Explanation:
The pattern is + 1, x 3, + 1, x 3, + 1, x 3, + 1,.....So, missing term = 67 x 3 = 201.
- 10. 0.5, 0.55, 0.65,0.8,?
Options- A. 0.9
- B. 0.82
- C. 1
- D. 0.95 Discuss
Correct Answer: 1
Explanation:
The pattern is + 0.05, + 0.10, + 0.15,.....So, missing term = 0.8 + 0.20 = 1.
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