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Question
Compute: `(8!)/((6 - 4)!)`
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Solution
`(8!)/((6 - 4)!)`
= `(8!)/(2!)`
= `(8 xx 7 xx 6 xx 5 xx 4 xx 3 xx 2!)/(2!)`
= 20160
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Show that
`("n"!)/("r"!("n" - "r")!) + ("n"!)/(("r" - 1)!("n" - "r" + 1)!) = (("n" + 1)!)/("r"!("n" - "r" + 1)!`
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