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OpenStudy (anonymous):
A lock has 24 numbers on it. If a 3-number sequence is to be made without repetitions being allowed, how many different sequences are possible?
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OpenStudy (lgbasallote):
im thinking use combination \[nCr = \frac{n!}{r!(n-r)!}\] therefore.. \[24C3 = \frac{24!}{3!(24-3)!}\] does that help?
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