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11 June, 03:02

How many ways can you select 4 volunteers out of 13?

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  1. 11 June, 03:29
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    It's a combination of 4 chosen among 13:

    ¹³C₄ = (13!) / (4!). (13-40!)

    ¹³C ₄ = (13!) / (4!). (9!)

    ¹³C ₄ = 715 Ways
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