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Question 31
Select the number that can replace the question mark (?) in the given number series.
121, 57, 21, 5, ?
Solution
$$121 - 8^2$$ = 121-64 =Â 57
$$57 - 6^2$$ = 57 - 36 = 21
$$21 - 4^2$$ = 21 - 16 = 5
$$5 - 2^2$$ = 5 - 4 = 1
So 1 will come in place of the question mark.
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