young_gun wrote:

A certain jar contains only b black marbles, w white marbles, and r red marbles. If one marble is to be chosen at random from the jar, is the probability that the marble chosen will be red greater than the probability that the marble chosen will be white?

1) r/(b+w) > w/(b+r)

2) b - w > r

I think the correct answer is E

A is insufficient because r/(b+w) does not take into account r in the denominator and w/(b+r) does not include w in the denominator.

B is sufficient because if b-w>r

If b=10 w=2 then 8>r

In this case P (R) can be greater or less than p(W)

C I cannot see a relationship

D Insufficient

E is the correct answer

What is the OA?