0
9C5 = 9! / (5!(9-5)! =>
9C5 = 9! / 5!4! =>
Cancel down by 5!. Hence
9Cr = 9x8x7x6 / 4 x 3 x 2 x 1
9C5 = 3 x 7 x 6 / 1 =>
9C5 = 126 The answer!!!!!
So out of nine people , there are 126 ways of choosing five people.
NB THe exclamation mark (!) after the number means 'factorial'.
So 5! = 5 x 4 x 3 x 2 x1
et seq!!!!
What else can I help you with?
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