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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.

7 : 56 : : 9 : ?

Option:
A. 63
B. 81
C. 90
D. 99
Answer: C . 90

Justification: The relationship is x : x(x + 1).

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