Q.

Number of positive integers n for which n2+96 is a perfect square is

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a

8

b

12

c

4

d

infinite

answer is C.

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Detailed Solution

Let m be a positive integer for which n2+96=m2⇒    m2−n2=96⇒(m+n)(m−n)=96⇒     (m+n){(m+n)−2n}=96⇒     m+n and m−n must be both even     96=2×48 or 4×24 or 6×16 or 8×12Number of solution = 4
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