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12 June, 11:13

Suzy randomly picks marbles form a bag containing 13 identical marbles. how many possible outcomes are there of she selects 10 marbles?

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  1. 12 June, 11:40
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    C (n, r) = P (n, r) / r!

    = (n * (n-1) ... (n-r+1)) / (r (r-1) ... 1)

    C (13,10) = (13*12*11*10*9*8*7*6*5*4) / (10*9*8*7*6*5*4*3*2*1)

    C (13,10) = 286 possible outcomes.
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