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19 August, 10:00

There are 1616 people in an office with 66 different phone lines. if all the lines begin to ring at once, how many groups of 66 people can answer these lines?

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  1. 19 August, 13:55
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    This is the number of combinations of 6 from 16.

    16C6 = (16*15*14*13*12*11) / (6*5*4*3*2*1)

    = 8 * 3 * 7 * 13 * 11 / 3

    = 8008 answer
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