What number comes next in this series? 126,225,123,169,120,121,117,____?

A. 113
B. 81
C. 123
D. 119

Explanation

The number that comes next in this series is 81

Because it follows the decending squaring of digits while leaving one digit in the midst as given

126,225,123,169,120,121,117,81 .i.e

15²⁼ 225
13²⁼ 169
11²⁼ 121
9²⁼ 81
7²⁼ 49

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