Question

Combinari de 7luate cate 3ori aranjamente de 10 luate cate 8

Answer 1

$C_{7}^{3} * A_{10}^{3} = \frac{7!}{3!(7-3)!} * \frac{10!}{(10-3)!} = \frac{1*2*3*4*5*6*7}{1*2*3*1*2*3*4} * \frac{1*2*3*4*5*6*7*8*9*10}{1*2*3*4*5*6*7}$$=5*7*8*9*10=25 200$