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Select the number from among the given options that can replace the question mark (?) in the following series. 7 : 56 :: 8 : 72 :: 9 : ?
Question

Select the number from among the given options that can replace the question mark (?) in the following series.
7 : 56 :: 8 : 72 :: 9 : ?

A.

100

B.

90

C.

99

D.

81

Correct option is B

Given: 7 : 56 :: 8 : 72 :: 9 : ?
Logic: The pattern follows N (N+1);  Where N is the first number in each pair (7, 8, 9)
Applying it to the given numbers:
7×(7+1)=7×8=56
8×(8+1)=8×9=72
9×(9+1)=9×10= 90
Thus, the correct option is (b) 90

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