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What is the missing number '?' in the series. 7, 25, 61, 121, ?​​
Question

What is the missing number '?' in the series.
7, 25, 61, 121, ?​​

A.

210

B.

212

C.

209

D.

211

Correct option is D

Given: 7, 25, 61, 121, ?​​
Logic: n3- n, where n is a consecutive natural number starting from 2.
23= 8, 8 - 1 = 7
33= 27, 27 - 2 = 25
43= 64, 64 - 3 = 61
53= 125, 125 - 4 = 121
For, missing term
63= 216, 216 - 5 = 211
The missing term is 211.
Thus, correct option is (d).




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