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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
105Â - $$(4)^2$$ =Â 89
89Â - $$(6)^2$$ =Â 53
53Â - $$(8)^2$$ =Â -11
=> Ans - (D)
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