PROBABILITY C13

A bag contains 6 red stones and 8 blue stones. Two balls are taken from the bag. What is the probability that they are both red?

Solution

(This is a problem with replacement)

n(R) = 6, n(B) = 8, n(S) = 14

P(R) = n(R)

            n(S)

1st pick = 6/14

2nd pick = 6/14 as well.

P(R) =  6      x    6

          14          14

P(R) =    36    =      4 

             196           49  

Therefore Probability of drawing a red stone is 4/49