NA 39 83 78 52 83 is the only number which is prime, while others are composite

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Home ‣ Verbal Reasoning ‣ Classification Comments

Question
NA
Options
A. 39
B. 83
C. 78
D. 52

Correct Answer

83

Explanation

83 is the only number which is prime, while others are composite numbers.

Classification problems

Search Results

1.
NA
Options
A. Sweet
B. Cake
C. Pastry
D. Bread

Discuss

Correct Answer: Sweet

Explanation:

Except 'Sweet', all the others are baked items.

2.
NA
Options
A. 78
B. 48
C. 72
D. 54

Discuss

Correct Answer: 78

Explanation:

Except '78', if you subtract 1, all the others give a prime number.

3.
NA
Options
A. Long
B. Tall
C. High
D. Dim

Discuss

Correct Answer: Dim

Explanation:

All other are adjectives denoting size.

4.
NA
Options
A. LOJ
B. FID
C. RUP
D. ILN

Discuss

Correct Answer: ILN

Explanation:

In all others, 1st letter + 3 = 2nd letter
And, 1st letter - 2 = 3rd letter

5.
NA
Options
A. TEETH
B. SLEEP
C. SHEEP
D. GREED

Discuss

Correct Answer: TEETH

Explanation:

In SLEEP,SHEEP and GREED,place of 'EE' is second from the right end while in TEETH,EE is second from the left end.

6.
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

7.
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

8.
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.

9.
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.

10.
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

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