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 ।