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How do you find the binomial coefficient of 20C15?

1 Answer

Mar 7, 2017

$= 15504$ $= 15504$

Explanation:

$C_{15}^{20} = \frac{20!}{(20 - 15)! 15!}$ $C_15^20 = (20!)/((20- 15)! 15 !)$

$= \frac{16 \times 17 \times 18 \times 19 \times 20}{120}$ $= (16 times 17 times 18 times 19 times 20)/(120)$

$= \frac{1860480}{120}$ $= 1860480/120$

$= 15504$ $= 15504$

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