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There are 4845 combinations of 4 numbers from the set 1 - 20

nCr = n!/r!(n-r)!

⇒ 20C4 = 20!/4!(20-4)!

= 20 x 19 x 18 x 17/4 x 3 x 2 x 1

= 4845

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13y ago

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Q: How many 4 different numbers of combination can you get from number1-20?
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