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# 100 Singapore Dollars

#### Shared by Best of Combinatorics

Singapore has dollar notes in denominations of $1$, $2$ and $5$. How many ways are there to form exactly $100$ using just multiples of these notes?

### Details and assumptions

The question does NOT state that you must use every denomination. Using 20 $5 notes (and 0$1 and 0 $2 notes) to form exactly$100 is a valid way.

3 tries left ·

### This Combinatorics problem was shared by Calvin Lin.

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