25. Choose the number which is different from others in the group?
A. 17
B. 27
C. 29
D. 37 E. 59
| Ans: B. |
| Sol. Each of the numbers except 27, is a prime number. |
26. Choose the number which is different from others in the group?
A. 120
B. 168
C. 290
D. 380 E. 728
| Ans: D. |
| Sol. Each of the numbers except 380, is either one less or one more than the square of a certain number. |
27. Choose the number which is different from others in the group?
A. 21
B. 39
C. 51
D. 63 E. 83
| Ans: E. |
| Sol. 83 is the only prime number in the group. |
28. Choose the number which is different from others in the group?
A. 29
B. 53
C. 85
D. 125 E. 147
| Ans: D. |
| Sol. 125 is the only number in the group which is a perfect cube. |
29. Choose the number which is different from others in the group?
A. 13
B. 17
C. 23
D. 37 E. 73
| Ans: C. |
| Sol. Each of the given numbers is a prime number. But the number obtained on reversing the digits of each of the numbers except 23, is also a prime number. |
30. Choose the number which is different from others in the group?
A. 27
B. 64
C. 125
D. 144 E. 162
| Ans: D. |
| Sol. Each of the numbers except 144, is a perfect cube. |
31. Choose the number pair/group which is different from others?
A. 15 : 46
B. 12 : 37
C. 9 : 28
D. 8 : 33
| Ans: D. |
| Sol. In all other pairs, 2nd number = (1st number × 3) + 1. |
32. Choose the number pair/group which is different from others?
A. 3 – 5
B. 5 – 3
C. 6 – 2
D. 7 – 3
| Ans: D. |
| Sol. In all other pairs, the sum of two numbers is 8. |
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