Prove or disprove for an integer n, if n 2 + 1 is perfect square, then n is even
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no n is not an even perfect square
bcoz if in both cases addition √3=1.7
and in other case √1=1
and √2=1.41
bcoz if in both cases addition √3=1.7
and in other case √1=1
and √2=1.41
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