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440, 360,288,224,_____

A.	170	B.	169
C.	168	D.	171
E.	156

Answer and Explanation

Answer:168

Explanation:
440, 360, 288, 224,
= 21^2 – 1, 19^2 – 1, 17^2 – 1, 15^2 – 1, _____
= The given numbers can be expressed in the form of n^2 – 1 of consecutive odd numbers starting from 21^2 – 1. Hence the next number in the series is 13^2 - 1 = 168

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