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How do you evaluate 8C2?

1 Answer

Jul 12, 2016

#28.#

Explanation:

We have, #""nC_r=(n!)/{(n-r)!r!}#

#:. ""8C_2=(8!)/{(8-2)!*2!}=(8!)/(6!*2!)=(6!*7*8)/(6!*2!)={cancel (6!)*7*8}/{cancel(6!)*2!}=56/(1*2)=28.#

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