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Number analogy section deals with two types of questions:
I. Choosing a similarly related pair as the given number pair on the basis of the relation between the numbers in each pair.
II. Choosing a number similar to a group of numbers on the basis of certain common properties that they possess.

8 : 81 : : 64 : ?

Option:
A. 125
B. 137
C. 525
D. 625
Answer: D . 625

Justification:

The relationship is x^ : (x + 1)(^+1).
Now, 64 = 43 
So, required number \ (4 + 1)(3+1) = 53 = 625.

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