You can only pick two marbles at a time, there are…
4 yellow marbles,
5 blue marbles,
4 red marbles, 7
2 green marbles.
I know the answer is suppose to be 2/35 but I don’t know how to get there…

I don’t know what the 7 means.
If you count it, then there are 22 marbles in all.
(4/22)(3/21) = (4*3)/(22*21) =
(2*1)/(11*7) = 2/77
If the 7 wasn’t supposed to be there, there are then 15 marbles.
(4/15)(3/14) = (4*3)/(15*14) =
(2*1)/(5*7) = 2/35

3 Responses

1. Sadflkaskdl Says:
   March 26th, 2010 at 12:25 am

   Damn, I totally forgot how to do all of this probability stuff they made us do like, last marking period.
   References :

2. Moony2222 Says:
   March 26th, 2010 at 12:56 am

   Add them up and put 2 on top like a fraction. 2/4+5+4+2 or 2/15.
   References :
   MIND!!

3. Dee W Says:
   March 26th, 2010 at 1:16 am

   I don’t know what the 7 means.
   If you count it, then there are 22 marbles in all.
   (4/22)(3/21) = (4*3)/(22*21) =
   (2*1)/(11*7) = 2/77
   If the 7 wasn’t supposed to be there, there are then 15 marbles.
   (4/15)(3/14) = (4*3)/(15*14) =
   (2*1)/(5*7) = 2/35
   References :

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