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19 February, 07:55

There are 12 people in a class. 10 are randomly chosen. How many possible combinations are there?

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  1. 19 February, 10:08
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    long way

    12 x 11 x 10 x 9 x 8 x 7 x6 x5 x4 x3x2 / 10x9x8x7x6x5x4x3x2x

    but you can shorten that by crossing out identical numbers so you get 12 x 11

    12 x 11 = 132 combinations
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