Help with Counting in Algebra3

Algebra
Tutor: None Selected Time limit: 1 Day

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?

Dec 1st, 2014

7C4= 7! / (7-4)!*4!

      = 7! / 3!*4!

      = 7*6*5*4*3*2*1 / 3*2*1*4*3*2*1

      = 35 ways

Dec 1st, 2014

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