P(26,5)

解答

P (26, 5)

7893600

求解步骤

= \frac{n !}{( n - r ) !}

代入

n = 26, r = 5

= \frac{26 !}{( 26 - 5 ) !}

\frac{26 !}{( 26 - 5 ) !} = 7893600

= 7893600

a r i t hm e t i c m e an 1.97, 1.57, 2.03

a r i t hm e t i c m e an 1.01, 1.03, 0.98, 0.99, 1.01, 1.02, 0.98, 1.05, 0.97, 0.98

9 n C r 3

a r i t hm e t i c m e an 2, 10, 6, 9, 1, 15, 11, 10, 15, 13, 15

30 C 10