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6!(n+1)!-7!*n!=0
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6!(n+1)! - 7!*n! = 0
6! * (n + 1) * n! = 7! * n! / : n~!
6! * (n + 1) = 7! / : 6!
n + 1 = (7 * 6!) / 6!
n + 1 = 7
n = 7 - 1
n = 6 ------ odpowiedź
7! = 7 * (7 - 1)! = 7 * 6!
n! = n * (n - 1)!
(n + 1)! = (n + 1) * n!
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6!(n+1)! - 7!*n! = 0
6! * (n + 1) * n! = 7! * n! / : n~!
6! * (n + 1) = 7! / : 6!
n + 1 = (7 * 6!) / 6!
n + 1 = 7
n = 7 - 1
n = 6 ------ odpowiedź
7! = 7 * (7 - 1)! = 7 * 6!
n! = n * (n - 1)!
(n + 1)! = (n + 1) * n!