1- Doesnot talk about the probability of selecting next ball - Not Sufficient
2. Total Number of Balls are not mentioned - NOt Sufficient

Even if you combine both we are not aware of total number of balls. So both statements together are insufficient

harsh.champ wrote:Two balls are to be picked at random from a drawer containing only black and white balls. What is the probability that both are white?

1. The probability of the first ball being black is 1/3.
2. There are 24 white balls in the drawer.

IMO E

s1) we dont know bth no. of black balls and total balls
hence insuff

s2)we dnt know no. of total ball
insuff

s1+s2=insuff
for same reasons

harsh.champ wrote:Two balls are to be picked at random from a drawer containing only black and white balls. What is the probability that both are white?

1. The probability of the first ball being black is 1/3.
2. There are 24 white balls in the drawer.

Drawer contains only black and white balls..
St. 1 ) The probability of the first ball being black is 1/3. so probability 1st ball being white is 2/3.we don't know about the probability of 2nd ball also we don't know total no. of balls..............insuff.
St.2)total no. of balls 24 ...but how much black or white is not known . ..........so insuff....

combined since..probability of the first ball being black is 1/3. so probability 1st ball being white is 2/3. so drawer contains 24/3 = 8 black balls and 2/3 x24 = 16 white balls

now we can easily calculate the probability of both ball being white... Ans C