If X is the difference of the squares of two consecutive even numbers. Which of the following numbers is a divisor of X?

A 4

B 7

C 8

D 9

E None of these

Solution

Correct Answer: Option A

ধরি
দুটি ক্রমিক জোড় সংখ্যা 2n এবং (2n + 2)
x = (2n + 2)² - (2n)²
   = (2n + 2 + 2n)(2n + 2 - 2n)
   = 2(4n + 2)
   = 2 × 2(2n + 1)
   = 4(2n + 1)
যা 4 দ্বারা বিভাজ্য ।

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