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There are 19,600 flops.

You will flop a made flush 165 times . . . (11x10x9) / 3!.

You will flop a flush draw 2,145 times . . . (11x10x39) / 2!.

You'll flop a flush OR flush draw 11.47% of the time - approximately once in 8.5 times.

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Please can you give the details of the factorial equation you used here.