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19 March, 19:40

Carey has 30 CDs and wants to take pick out 5 to put into her CD player. How many different combinations of CDs can she pick out?

C (30, 5)

C (25, 5)

30!

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  1. 19 March, 19:57
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    The correct answer is C (30,5)

    That's because you have to know factorials and apply the formulas to find out that:

    30! / [5! (30 - 5!) ]

    30! / (5! * 25!), which means that there are 142506 combinations, or C (30,5)
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