Doprowadź wyrażenie do najprostszej postaci : a) (n+2)(n+1)n!
(n+2)(n+1)n!=(n²+n+2n+2)n!=(n²+3n+2)n!=(n²+3n+2)*(1*2*...*n)
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(n+2)(n+1)n!=(n²+n+2n+2)n!=(n²+3n+2)n!=(n²+3n+2)*(1*2*...*n)