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December 21, 2014

December 21, 2014

Posted by **Kayla** on Monday, February 13, 2012 at 6:29pm.

- Math -
**Reiny**, Monday, February 13, 2012 at 7:03pmI see 2 cases

1. 3 coins are dimes, the 4th is a quarter

2. all 4 coins are dimes

number of selections for case 1 : C(7,3)*C(5,1)

= 35*5 = 175

number of selection for case 2: C(7,4) = 35

number of "at least 3 dimes" is 175+35 = 210

btw, did you mean to ask the same question twice?

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