NA 143 257 195 15 143 ? 122 - 1,257 ? 162 + 1, 195 ? 142 - 1, 15 ? 42

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Question
NA
Options
A. 143
B. 257
C. 195
D. 15

Correct Answer

15

Explanation

143 ? 12² - 1,257 ? 16² + 1, 195 ? 14² - 1, 15 ? 4² - 1,
Hence, '257' is odd one.

Classification problems

Search Results

1.
NA
Options
A. 84
B. 120
C. 72
D. 98

Discuss

Correct Answer: 98

Explanation:

Except '98' ,all other are multiples of 6.
84 ? 6 x 14, 120 ? 6 x 20,72 ? 6 x 12,108 ? 6 x 18

2.
NA
Options
A. 27
B. 64
C. 125
D. 384

Discuss

Correct Answer: 384

Explanation:

Except '384' , all the others are perfect Cube of natural number.

3.
NA
Options
A. 169
B. 225
C. 289
D. 225

Discuss

Correct Answer: 225

Explanation:

Except '225' , all the other are perfect squares of natural numbers.

4.
NA
Options
A. 25
B. 64
C. 189
D. 441

Discuss

Correct Answer: 189

Explanation:

Except '189', all the others are square number.
25 ? 5², 64 ? 8², 225 ? 15² and 121 ? 11²

5.
NA
Options
A. 31
B. 39
C. 47
D. 41

Discuss

Correct Answer: 39

Explanation:

Except '39', all the others are prime numbers, while 39 is a composite number
As, 39 ? 13 x 3

6.
NA
Options
A. Cuckoo
B. Crow
C. Bat
D. Parrot

Discuss

Correct Answer: Bat

Explanation:

Except 'Bat' all the others are birds but bat is a mammal.

7.
NA
Options
A. Fruit
B. Flower
C. Leaf
D. Tree

Discuss

Correct Answer: Tree

Explanation:

Except 'tree' , all the other are its parts.

8.
NA
Options
A. 39
B. 69
C. 57
D. 117

Discuss

Correct Answer: 117

Explanation:

Except '117' all the others give a prime number when divided by 3.

9.
NA
Options
A. Tree
B. Plant
C. Shrub
D. Farm

Discuss

Correct Answer: Farm

Explanation:

Except 'Fram', all the others are form a plants.

10.
NA
Options
A. Sharpener
B. Calculator
C. Eraser
D. Pencil

Discuss

Correct Answer: Calculator

Explanation:

Except 'Calculator', all the others are stationary items that work mechanically, while calculator works electronically.

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