Matematika

Pertanyaan

Nilai dari 7nP3 = 6n+1P3

1 Jawaban

  • jawab

    7 (nP3) = 6 (n+1)P3
    7 n!/ (n-3)! = 6 (n+1)! / (n+1-3)!
    7 n! / (n-3)! = 6  (n+1)! / (n-2)!
    7 n!/(n+1)!  = 6 (n-3)! / (n-2)!
    7 n!/ (n+1). n!  = 6  (n-3)! / (n-2)(n-3)!
    7/(n+1) = 6 /(n-2)
    7(n-2) = 6(n+1)
    7n - 14 = 6n + 6
    7n - 6n = 7 +14
    n = 21

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