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for a) I found
C(25,8)*C(17,7)*C(10,6)*C(4,4)

for b) I found
\[\frac{70!}{46!*24!}\]

outcomes = arrangement...i think

for c) my result is
\[\frac{45!}{25!*20!}\]

So..... npr

outcomes= how many ways we have to do that..

why we need to multiply by 25!

do you think color is important..

Diffrent

so we need to multiply by 25! then.. because we have different color pens..

oh repeated permutation, so in our case 25!/(8!7!6!4!) right..

it makes sense..thanks..

no I don't (:

@eliassaab is...very strong in permutation and combination

for b) is 800 important?

but there is only one way color is the same..

every members can take only one pen, one member cannot take 0 or 2,3,.....25 pens

the question is whether one can choose only only 1 red from the 7

this question really confuses..))

Wat Did u understand frm the question

1st and 2nd option are the same or not..

we are not arranging them we are choosing them, are we?

the question asks for...possible outcome...

Thanks for your help, I gotta go to library get a book about this topic.. see you later (:

I'm going to Office Depot to buy my own markers!

but thees are free, choose one :P

@eliassaab can you look at my question, I am stuck

a)
\[
\frac{25!}{7! 4! 6!
8!}=4417238826000
\]
Which the same as you got/

thanks..

@satellite73 can you look at my question, if you are
not busy