SOLUTION: In how many ways can $10.00 be changed into quarters and dimes with at least one of each coin being used?

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Question 378371: In how many ways can $10.00 be changed into quarters and dimes with at least one of each coin being used?
Answer by edjones(7569) About Me  (Show Source):
You can put this solution on YOUR website!
There have to be an even number of quarters.
10/.5=20-1=19 ways There can't be all quarters, hence the -1.
.
Ed