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-2 Combinations
• Combination-order doesn’t matter; can have repition or not
• Graphing calculator• n#,math,PRB 3,r#,enter
!
!( )!
n nnCr
r r n r
Example
• 5 cousins at a family reunion decide that 3 of them will go to pick up a pizza. How many ways can they choose the 3 people to go?5
103
Multiple events-Combination with fundamental counting principle
• 5 cards are drawn from a standard deck of cards. How many hands consist of 3 clubs and diamonds.
• 52 cards in a deck, 13 clubs, 13 diamonds
13 13286 78 286 78 22308
3 2
Combination with total• A wallet contains a $1 bill, a $5 bill, $10 bill,
$20 bill. How many different sums of money can be made from the money in the wallet?
41 1 4 6 4 15
4
44
3
46
2
44
1
Assignment