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Any 5 from 20 is (20 x 19 x 18 x 17 x 16)/(5 x 4 x 3 x 2) = 15504.

If the order doesn't matter, eg 12345 and 12354 count as different, the answer is tha above multiplied by 120...

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12y ago
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Q: How many different ways can 5 addresses be selected from 20?
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