



 
Hi Rimoshika, You haven't said so but I expect you are to find the greatest common divisor (GCD) of $n^2  3n  1$ and $3$ where $n$ is any positive integer. The only divisors of $3$ are $1$ and $3$ and hence the GCD is either $1$ or $3.$ Can it be $3?$ Can you find an $n$ so that $3$ is not a divisor of $n^2  3n  1?$ Penny  


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