algebra

Tarot cards are used for telling fortunes, and in a reading, the arrangement of the cards is as important as the cards themselves. How many different readings are possible if four cards are selected from a set of seven Tarot cards?

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  1. not combinations because order does not matter in combinations
    we need permutations of 7 taken 4 at a time
    p(n,r) = n!/(n-r)!
    = 7!/3!
    = 7*6*5*4 = 840

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  2. Thank you very much

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