Coinbinations (1)

Probability Level 1

I want to buy a $1.00 newspaper. I have just enough pennies ($0.01), nickels ($0.05), dimes ($0.10), and quarters ($0.25) to buy the newspaper in every possible exact-change combination of those coins.

How many coins do I have?

Note: "Exact-change combination" doesn't necessarily mean that you must use more than 1 kind of coins listed above. For example, paying 4 quarters is allowed.

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