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19 December, 12:32

A combination lock will open when the right choice of three numbers, from 1 to 30, is selected. how many

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  1. 19 December, 12:46
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    Number of ways (if repeats of numbers are allowed) = 30 x 30 x 30 = 27000

    Number of ways (if repeats of numbers are not allowed) = 30 x 29 x 29 = 24360
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