Question

P(13,r)=156 permutation po
​

Answer 1

$\underline{\textbf{Given:}}$

$\mathsf{P(13,r)=156}$

$\underline{\textbf{To find:}}$

$\textsf{The value of 'r'}$

$\underline{\textbf{Solution:}}$

$\underline{\textsf{Concept used:}}$

$\mathsf{P(n,r)=n{\times}(n-1){\times}(n-2)\;.\;.\;.r\;factors}$

$\mathsf{Consider,}$

$\mathsf{P(13,r)=156}$

$\textsf{This can be written as}$

$\mathsf{P(13,r)=13{\times}12}$

$\mathsf{P(13,r)=P(13,2)}$

$\implies\boxed{\mathsf{r=2}}$

$\underline{\textbf{Find more:}}$

P (7,x) = 840

P= Permutation

With solution pleas

https://brainly.in/question/37701173  

If 16Pr-1 : 15Pr-1 = 16 : 7 then find r.

a) 10

b) 12

c) 7

d) 8​

https://brainly.in/question/30103175