Asked by Christian
Ivan has a 5-cent stamp, a 10-cent stamp, and a 20-cent stamp.How many different combinations of postage can he form with the stamps?
Answers
Answered by
bobpursley
3! is a nice number here.
Oh, you might not know about factorials yet.
3*2*1 is a nice number then.
Oh, you might not know about factorials yet.
3*2*1 is a nice number then.
Answered by
Steve
There are 2^3-1 = 7 ways to choose at least one stamp.
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