Thread: Algebra 2 probability question

there are a bag of 7 marbles, 3 red 4 green

if u pick 2 marbles, what is the probability of choosing one green and one red (order doesnt matter)?

isn't it 3/7 x 4/6?

i kno 4 nCr 1 x 3 nCr 1 divided by 7 nCr 2 is the correct answer but how is it different from 3/7 x 4/6?

Hello, mairjuanaman!

There are a bag of 7 marbles: 3 red, 4 green.

if u pick 2 marbles, what is the probability of choosing one green and one red (order doesn't matter)?

Isn't it 3/7 x 4/6 ? . . . . . no

You found the probability of getting a Red, then a Green . . . in that order.



And: .


Therefore: .


This is the same answer as: .