Reasoning | Number Analogies - Aptitude

1. Find the missing number. 25; 36::49,?

1) 61
2) 63
3) 65
4) 60

...Answer is 4)
When the numbers in the question are considered the students tend to consider 25 and 36 as squares of two consecutive natural numbers. But the answer the choice does not consist of an answer suitable to the above logic. Hence, it is important that the student keeps the answer choices in view in arriving at the logic. 25 + 11 =36 Similarly, 49 + 11 = 60

2. Find the missing number. 27 : 51 :: 83:?

1) 102
2) 117
3) 123
4) 138

...Answer is 3)
5 and 7 are successive odd numbers. Similarly, next odd number to 9 is 11 and 11^2 + 2 = 121 + 2 = 123.

3. Find the missing number. 11 : 25 ::17: ?

1) 33
2) 28
3) 41
4) 37

...Answer is 4)
11 x 2 + 3 = 22 + 3 = 25 Similarly, 17 x 2 + 3 = 34 + 3 = 37.

4. 2, 12, 36, 80, 150,??

1) 252
2) 219
3) 271
4) 262

...Answer is 1)
The given series is an alternate series.