Срочно! Докажите, что для любого натурального n верно равенство:
а) n! + (n+1)! = n! (n+2)
б) (n-1)! + n! + (n+1)! = (n+1)²(n-1)!
в) (n+1)! / (n-1)! = n² + n
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