Evaluate n ! r !(n-r) ! , when n = 5, r = 2 - Vidyadip

Question

Evaluate $\frac{n !}{r !(n-r) !}$, when n = 5, r = 2

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Answer

Now,to find $\frac{n !}{r !(n-r) !}$ (since n = 5, r = 2)
We have, $\frac{5 !}{2 !(5-2) !}=\frac{5 !}{2 ! \times 3 !}=\frac{5 \times 4}{2}=10$

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