# 4.2 Factorials and Permutations. Factorial I have 4 cards, how many different ways can I pick those 4 cards if order matters.

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4.2 Factorials and Permutations

Factorial I have 4 cards, how many different ways can I pick those 4 cards if order matters.

Factorial

On calculator

Factorials

Choir A senior choir has rehearsed five songs for an upcoming assembly. In how many different orders can the choir perform the songs?

Example In how many different ways could ten questions on a test be arranged, if the easiest question and the most difficult question – Are side by side – Are not side by side

Permutations

Permutation In how many different orders can eights nominees for the student council give their speeches?

Permutation In how many ways could a president and vice- president be chosen from a group of eight nominees?

Permuation Formula?

Permutation

Example In a card game, each player is dealt a face down “reserve” of 13 cards that can be turned up and used one by one during a game. How many different sequences of reserve cards could a player have?

Assignment Pg 239 #’s 1,2,4,6,7,9,18

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