An urn contains 3 white, 4 red and 5 black balls. Two balls are drawn one by one without replacement. What is the probability that at least one ball is black?

An urn contains 3 white, 4 red and 5 black balls. Two balls re drawn one by one without replacement. What is the probability that at least one ball is black?

A bag contains 5 white,7 red and 8 black balls.Four balls are drawn one by one with replacement,what is the probability that at least one is white?

A bag contains 5 white,7 red and 4 black balls.If four balls are drawn one by one with replacement,what is the probability that none is white?

A bag contains 5 white,7 red and 3 black balls.If three balls are drawn one by one without replacement,find the probability that none is red.

A bag contains 5 white; 7red and 4 black balls. If four balls are drawn one by one with replacement; what is the probability that none is white?

An urn contains 10 white and 5 black balls. Two balls are drawn from the urn one after the other without replacement. What is the probability that both drawn balls are white?

A bag contains 3 white, 4 red and 5 black balls. Two balls are drawn one after the other, without replacement. What is the probability that one is white and the other is black?

A bag contains 5 white; 7 red and 8 black balls.If four balls are drawn one by one without replacement; find the probability of getting all white balls.

A bag contains 10 white and 15 black balls. Two balls are drawn in succession without replacement.What is the probability that first is white and second is black?

A bag contains 10 white and 15 black balls. Two balls are drawn in succession without replacement.What is the probability that first is white and second is black?