n(n-3)/2=54 find n by factorization
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n ( n - 3) =108
n ( n - 3 ) = 12 × 9
n ( n - 3) = 12
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n ( n - 3) =108
n ( n - 3 ) = 12 × 9
n ( n - 3) = 12
please mark brainlist
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