Homework Help: math

Posted by Shawn on Wednesday, September 15, 2010 at 10:41pm.

selecting three (3) coins, but assume that there are 5 dimes, 4 nickels, and 2 quarters.

In how many possible ways can the selection be made so that the value of the coins is at least 25 cents?

math - Reiny, Wednesday, September 15, 2010 at 10:58pm
The only possible cases are, hope I did not miss any
DDD - 30
DDN - 25
DDQ - 45
DNN - 20
DNQ - 40
DQQ - 60
NNN - 15
NNQ - 35
NQQ - 55

How many of these amount to at least 25 cents?

(notice that the fact that we have 5 dimes and 4 nickels is of no consequence, since we can use at most 3, but the 2 quarters limits the cases)

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