# Thread: I need math help...

1. ## I need math help...

I dont know why but i just can't seem to understand this...but right now in math were learning permutations and combinations. pretty easy concept. heres the question

A bag contains 3 red, 5 yellow, and 8 blue marbles. how many ways can 2 red, 1 yellow, and 2 blue marbles be chosen

question was changed. turns out i was retarded

2. There are programs on calculators that will do this for you, but if you want an actual lesson the calculator can't teach you.

3. Originally Posted by Commander X
There are programs on calculators that will do this for you, but if you want an actual lesson the calculator can't teach you.
yea i know my calculator will. i need to understand it...

4. Originally Posted by Swiftdude

yea i know my calculator will. i need to understand it...
OK well first do you understand that this is a combination equation and not a permutation.

5. Originally Posted by Commander X
OK well first do you understand that this is a permutation equation and not a combination.
still no .

6. Originally Posted by Swiftdude

um no .

So a Permutation is when order does matter.

When order matters AB DOES NOT equal BA.

But a combination is when the order does not matter.
AB = BA.

Edit: The only bad thing is that the question doesn't state whether order matters or not.

7. Originally Posted by Commander X

So a Permutation is when order does matter.

When order matters AB DOES NOT equal BA.

But a combination is when the order does not matter.
AB = BA.
right .

8. So if the order did not matter than there would be only one way to take the marbles out of the bag.

9. im pretty sure its a combination.

10. Ok if it is here Permutations and Combinations

I have to get back to my own homework, if I had the time I would explain it.

11. cant find one the corresponds with my problem