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The number of positive integers n for which n2+96 is a perfect square
is
(A) 0 (B) 1 (C) 2 (D) 4

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The answer is 4, because, I found three numbers satisfying the given equation, which are : 2,5,10 and since the answer cant be 2 therefore the answer is obviously 4.
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Is there any procedure to find the numbers ?
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