Question

(A_{15} ^ 2)/(A_{16} ^ 3 * P_{5})​

Answer 1

Объяснение:

$\frac{A_{15}^2}{A_{16}^3}*P_5 = \frac{\frac{15!}{(15-2)!} }{\frac{16!}{(16-3)!} } *5!=\frac{\frac{13!*14*15*1*2*3*4*5}{13!} }{\frac{13!*14*15*16}{13!} }=\frac{14*15*120}{14*15*16} =\frac{120}{16}=7,5.$