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19 September, 13:22

A combination lock uses three numbers between 1 and 57 with repetition, and they must be selected in the correct sequence. which of the five counting rules is used to find that number? how many different "combinations" are possible? is the name of "combination lock" appropriate? if not, what other name would be better?

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  1. 19 September, 13:37
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    A) The "fundamental" counting rule seems appropriate.

    b) 57^3 = 185,193 "combinations" are possible

    c) Since sequence is important, perhaps "permutation lock" would be appropriate.
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