Question

The value of €10r.rpr is where r=1

Answer 1

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Answer 2

$10r\cdot ^rp_r=10$ where r=1.

Step-by-step explanation:

Given : €10r.rpr is where r=1.

To find : The value of expression ?

Solution :

Expression is $10r\cdot ^rp_r$.

$^nP_r=\frac{n!}{(n-r)!}$

Substitute r=1,

$10r\cdot ^rp_r=10(1)\cdot ^1p_1$

$10r\cdot ^rp_r=10\cdot \frac{1!}{(1-1)!}$

$10r\cdot ^rp_r=10\cdot \frac{1!}{0!}$

$10r\cdot ^rp_r=10\cdot 1$

$10r\cdot ^rp_r=10$

Therefore, $10r\cdot ^rp_r=10$ where r=1.

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