Math Probability Formula

[rooney09]

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Can anyone please explain when to use this formula, and how did you know when to use it-

(nCr) x (p^r) x (q^n-r)

Thx in advance

 

[Streetwolf]

Can anyone please explain when to use this formula, and how did you know when to use it-

(nCr) x (p^r) x (q^n-r)

Thx in advance

There's a few threads with this on the first couple pages. Alternatively do a search. More alternatively, wait for someone else to post another explanation here.