Tuesday

April 21, 2015

April 21, 2015

Posted by **kitkat** on Tuesday, November 16, 2010 at 5:40pm.

- combinations -
**MathMate**, Tuesday, November 16, 2010 at 10:55pmNumber of ways he can choose two shoes

=14C2

=14!/(2!12!)

=14*13/2

=91

Number of ways he can choose matching shoes

= 7

So how many ways can he choose non-matching shoes?

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