• Dec 12th 2007, 12:10 PM
sabanknight
! need a refresher on this I cant find my notes and my profestor is no where to be found any help is apreciated ^ ^

1)if you are recieving 8 books as gifts and there are 27 different titles how many possible selections are there if each title can only be used once?:
the way I remember it you should set it up like this if g=gift
g27
g26
g25
g24
g23
g22
g21
g20
only thing is do I multiply those or add or what? also if anyone knows how it would be entered on a TI-83 plus that would help as well

2)If a fair die is rolled what is the probability that the number rolled is 5 given that it is odd
P= favorable/total outcoms p=1/6 also does the given it is odd part have any effect on the problem or is it extra info?

3)resteraunt offers 3 types of lettuce 5 toppings and 6 dressings in a salad how many combinations are there asuming only one toping letucce and dressing can be chosen
S T5 D6 6x5=30 30x3=90 ans=90
• Dec 12th 2007, 01:34 PM
Plato
Quote:

Originally Posted by sabanknight
1)if you are recieving 8 books as gifts and there are 27 different titles how many possible selections are there if each title can only be used once?:

2)If a fair die is rolled what is the probability that the number rolled is 5 given that it is odd

3)restaurant offers 3 types of lettuce 5 toppings and 6 dressings in a salad how many combinations are there assuming only one toping lettuce and dressing can be chosen

For #1 why does the order in which you receive the books matter?
It seems to me that only the content of the gift matters. So it is a combination.
\$\displaystyle {{27} \choose {8}}\$.

For #2, there are just three odd numbers.

For #3 You multiply: (3)(5)(6).