Question: A lock has a 3-number code made up of 20 numbers. If none of the numbers are allowed to repeat, how many different ways can

A lock has a 3-number code made up of 20 numbers.

A lock has a 3-number code made up of 20 numbers. If none of the numbers are allowed to repeat, how many different ways can you choose three different numbers in order for a unique code?

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