Question

Two black balls and five white balls are placed in a bag. If Amy draws two balls from the bag, what is the probability that they are both white? Please show your work.

Answer 1

first ball and second ball

5 white out of 7 total x 4 white remaining out of 6 total remaining

`(5)/(7)` x
`(4)/(6)`

`= (5*4)/(7*6) = (20)/(42) = (10)/(21)`

Answer 2

2 +5 = 7 total balls.

!st one being white = 5/7

2nd one being white = 4/6 = 2/3

Chance of both being white = 5/7 x 2/3 = 10/21