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I think you'll be surprised how many there are, and will understand why they are not being listed!

Any 6 from 20: (20 x 19 x 18 x 17 x 16 x 15)/(6 x 5 x 4 x 3 x 2)= 38,760

If you allow the same numbers to be in any order eg 123456/123465/123645 etc then you have to multiply the previous figure by (6 x 5 x 4 x 3 x 2) ie 720 to get an answer of

Twentyseven million nine hundred and seven thousand two hundred

(27,907,200)

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12y ago
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Q: How many combinations of 6 numbers are there in 20 numbers what are these combinations?
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