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That would be:

20! / 10!

= 20 * 19 * 18 * 17 * 16 * 15 * 14 * 13 * 12 * 11

= 670442572800

* * * * *

No!

That is the number of permutations! The number of combinations is 20C10 = 20!/(10!*10!) = 20*19*18*17*16*15*14*13*12*11/(10*9*8*7*6*5*4*3*2*1)

= 184,756

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12y ago

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