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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