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11 p r = 12 p …

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11 p r = 12 p r-1 Find r Permutation
  • 4 answers

Dεερακ Ȿιηɠꜧ 4 years, 3 months ago

Sorry , last one was wrong , $$r=9 & 16$$
by solving eq.
$$ r^2 -25r+144=0$$

Dεερακ Ȿιηɠꜧ 4 years, 3 months ago

$$\frac{11!}{r(r-1)!}= \frac{12×11!}{(r-1)!} =$$
$$\frac{1}{r} =12$$
$$r=\frac{1}{12}$$

Akshita Pandey 4 years, 3 months ago

r=9

Vivek Kumar 4 years, 3 months ago

r = 1/12
http://mycbseguide.com/examin8/

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