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100 Singapore Dollars

Best of Combinatorics 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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