Question 18

In the following question, select the missing number from the given series.
?, 5, 15, 45, 113

Solution

If we reverse the series as : 113, 45, 15, 5, ?

Then number of the form = $$(n^3+n)$$ are subtracted, where $$n$$ is a natural number.

113 - $$(4^3+4)$$ = 45

45 - $$(3^3+3)$$ = 15

15 - $$(2^3+2)$$ = 5

5 - $$(1^3+1)$$ = 3

=> Ans - (C)

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In the following question, select the missing number from the given series.?, 5, 15, 45, 113