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avatar+444 

Compute:  \(\dbinom{15}{2}\)

 Oct 20, 2017

Best Answer 

 #2
avatar+444 
+2

Here is the full answer:

 

\(\begin{align*} \dbinom{15}{2} &= \dfrac{15!}{13!2!} \\ &= \dfrac{15\times 14}{2\times 1} \\ &= 15 \times \dfrac{14}{2} \\ &= 15 \times 7 \\ &= \boxed{105}. \end{align*}\)

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 Oct 20, 2017
 #1
avatar
+1

15nCr2 =105

 Oct 20, 2017
 #2
avatar+444 
+2
Best Answer

Here is the full answer:

 

\(\begin{align*} \dbinom{15}{2} &= \dfrac{15!}{13!2!} \\ &= \dfrac{15\times 14}{2\times 1} \\ &= 15 \times \dfrac{14}{2} \\ &= 15 \times 7 \\ &= \boxed{105}. \end{align*}\)

Mr.Owl Oct 20, 2017
 #3
avatar+95856 
+1

Very nice, Mr. O   !!!!!!

 

 

cool cool cool

 Oct 20, 2017

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