Question

permutation

find the value of r if 11p3r=110​

Answer 1

Answer:

The value of r is

$\bf\,r=\frac{1}{9}$

Step-by-step explanation:

$\textbf{Concept:}$

$\boxed{\bf^nP_r=n(n-1)(n-2)..........r\;factors}$

$\textbf{Given:}$

$(^{11}P_3)r=110$

$(11{\times}10{\times}9)r=11{\times}10$

$\implies9\,r=1$

$\implies\boxed{\bf\,r=\frac{1}{9}}$