Question 44

Select the number from among the given options that can replace the question mark (?) in the following series.
28, 27, 31, 22, 38, 13, 49, ?

Solution

$$28-1^2$$ = 28-1 = 27

$$27+2^2$$ = 27+4 = 31

$$31-3^2$$ = 31-9 = 22

$$22+4^2$$ = 22+16 = 38

$$38-5^2$$ = 38-25 = 13

$$13+6^2$$ = 13+36 = 49

$$49-7^2$$ = 49-49 = 0

Hence '0' will come in place of the question mark.

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Select the number from among the given options that can replace the question mark (?) in the following series.28, 27, 31, 22, 38, 13, 49, ?