pushpitkc wrote:
The expression f(x)=x^2−1 = (x+1)(x-1)
Evaluating answer options
A. 1812 : f(x) = (1813)(1811)
B. 2721 : f(x) = (2722)(2720)
C. 3118 : f(x) = (3119)(3117)
D. 4245 : f(x) = (4244)(4246)
E. 5653 : f(x) = (5654)(5655)
Of the answer options, we can reject Options A and C straightaway,
as they are not divisible by 2.
Carefully evaluation the other answer options :
Option B = Both 2722 and 2720 are divisible by 2 but not by 3
Option D = Both 4244 and 4246 are divisible by 2 but not by 3.
But,
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