SOLUTION: CD Purchase Neo Anderson wants to purchase six different CDs but only has enough money to purchase four. In how many ways can he select four of six CDs for purchase? please show

SOLUTION: CD Purchase Neo Anderson wants to purchase six different CDs but only has enough money to purchase four. In how many ways can he select four of six CDs for purchase? please show

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Question 447034: CD Purchase Neo Anderson wants to purchase six different CDs but only has enough money to purchase four. In how many ways can he select four of six CDs for purchase?
please show step by step for better understanding! Thanks!
Answer by jorel1380(3719) (Show Source): You can put this solution on YOUR website!
6 cd's selected 4 at a time equals 6C4, which equals:
6!/4!2!=6x5x4!/2!x4!=30/2=15 different ways to buy 4 cd's..
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