Question

calcule

A15,12/ A15,3 x A12,3 x A9,3 X A6,3

Answer 1

[A15,12/ A15,3 ]x [A12,3] x [A9,3] X A6,3

[15!/(15-12)!  / 15!/(15-3)!]   x  [12!/(12-3)!] x [9!/(9-3)!] x [6!/(6-3)!]

[15!/(15-12)!  / 15!/(2)!]   x  [12!/(12-3)!] x [9!/(9-3)!] x [6!/(6-3)!]

[15!/(3)!  x (2)!/15! ]   x  [12!/(9)!] x [9!/(6)!] x [6!/(3)!]

[1/(3)!  x (2)!]   x  [12!/(9)!] x [9!/(6)!] x [6!/(3)!]

[2/6]]   x  [12!] x [1] x [1/6]

12! * 2/36

12!/18