15 nCr 5

Soluzione

15 n C r 5

3003

Fasi della soluzione

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

Inserire in

n = 15, r = 5

= \frac{15 !}{5 ! ( 15 - 5 ) !}

\frac{15 !}{5 ! ( 15 - 5 ) !} = 3003

= 3003

c (10, 3)

s t d 50, 60, 70, 80, 90

v a r ian ce 10, 12, 15, 18, 11, 13, 14, 16, 19, 20

10 n C r 5

7 P 7