Twenty factorial which is denoted by "20!".
20! = 1x2x3x4x5x6x7x8x...x19x20
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20
There are 125970 combinations and I am not stupid enough to try and list them!
There are 23C3 = 23!/(20!*3!) = 23*22*21/(3*2*1) = 1,771 combinations.
There are many combinations of two numbers that add up to 36. One combination is 20 + 16
20