SSC MTS 2021 Question Paper Shift 3 (Oct 11th)

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 = 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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