1*20, 2*10, 4*5.
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20 pennies, 4 nickles, and 2 dimes. 3 ways.
20 + 8 = 28p
There are not 20 ways - there are only 12.
If that's the only denomination you have there's only one way: 20 nickels = $1.
Assuming the 20 are all different, there are 20C11 = 20!/(11!*9!) = 167,960 ways.