Answers

  • Brainly User
2016-03-01T19:10:58+08:00
Permutation - order is considered (first, second, third)

P (n,r) =   \frac{n!}{(n-r)!}

P (10, 3) =  \frac{10!}{(10-3)!}

P (10, 3) =  \frac{10!}{7!}

P (10, 3) = (10×9×8×7×6×5×4×3×2×1) ÷ (7×6×5×4×3×2×1)

P (10,3) = 10×9×8

P (10,3) = 720

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