if-p-r-n-49-c-r-n-196-find-the-valve-of-r-and-n-pleas-sir-help-me-

Question Number 73983 by mhmd last updated on 17/Nov/19

i f p_{r}^{n} = 49, c_{r}^{n} = 196 f i n d t h e v a l v e o f r a n d n ?

p l e a s s i r h e l p m e

Answered by $@ty@m123 last updated on 17/Nov/19

4 \times^{n} P_{r} =^{n} C_{r}

\Rightarrow \frac{4 . n!}{(n - r)!} = \frac{n!}{r! (n - r)!}

\Rightarrow r! = \frac{1}{4}

N o t p o s s i b l e .

Commented by JDamian last updated on 17/Nov/19

^{n} P_{r} <^{n} C_{r} ?

W h y 4 \times ?

Commented by $@ty@m123 last updated on 17/Nov/19

∵ 4 \times 49 = 196

Answered by arkanmath7@gmail.com last updated on 17/Nov/19

r! = \frac{1}{4}

s e a r c h i n g a m m a f u n c t i o n

r! = Γ (r + 1) = r Γ (r) = r \int_{0}^{\infty} e^{- x} x^{r - 1} d x