Question 15

Select the option that will correctly replace the question mark (?) in the series.
109, 105, 89, 53, ?

Solution

Squares of consecutive even natural numbers are subtracted.

109 - $$(2)^2$$ = 105

105 - $$(4)^2$$ = 89

89 - $$(6)^2$$ = 53

53 - $$(8)^2$$ = -11

=> Ans - (D)

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