Question

n2-1 is divisible by 8, if n is
(A) an integer
(B) a natural number
(C) an odd integer
(D) an even integer ​

Answer 1

Answer:

Here n can be ever or odd. Case I n = Even i.e., n = 2k, where k is an integer. At k = -1, = 4(-1)2 - 1 = 4 - 1 = 3, which is not divisible by 8. ... At k = -1, a = 4(-1)(-1+1) = 0 which is divisible by 8.

Step-by-step explanation:

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