Grade 12 math questions, please help explain
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Grade 12 math questions, please help explain

[From: ] [author: ] [Date: 12-03-13] [Hit: ]
.-Ayla plans to play 5 of her 9 favourite cds at her birthday party so that each cd is only played once. In how many different orders can she play the 5 cds? The answer is 15 120.........
-how many 3-person executives of a chairperson, a vice-chairperson, and a secretary can be formed from a committee of 12 people? The answer is 320...

-Ayla plans to play 5 of her 9 favourite cds at her birthday party so that each cd is only played once. In how many different orders can she play the 5 cds? The answer is 15 120.....

-How many 5-digit whole numbers begin with a 7 or an 8? the answer is 10 000

I don't understand any of this so please some one help????

-
1) 12 * 11 * 10 = 1320, not 320

12 ways of choosing the chairperson, for each choice there are 11 choices for the vice-chairperson and finally for each choice of chair and vice-chair there are 10 choices remaining for secretary.

These are called a permutation. If you are reading your text book, the answer is the number of permutations of 12 unique objects taken 3 at a time.

12P3 or P(12, 3) are notations used for this computation. The computation is 12!/(12 - 3)! = 12!/9!

Find this in your textbook and read.
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