Carilah n dari n !/(n – 2)! = 6

by

Jawab:

    n!    = 6
(n – 2)!
⇔ n(n – 1)(n – 2)! = 6
            (n – 2)!
⇔ n² – n = 6
⇔ n² – n – 6 = 0
⇔ (n – 3)(n + 2) = 0
⇔ n = 3 atau n = -2
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