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Nine options, no repeats, three slots.The equation for this is as follows:


9!/(3!*(9-3)!)


9*8*7*6*5*4*3*2*1 / (3*2*1)*(6*5*4*3*2*1)


= 9*8*7 / 3*2*1

= 504 / 6

= 252 / 3

= 84


84 combinations.

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