Two balls are selected from a box containing 2 blue and 7 red balls. What is the probability that at least one ball is blue?

A box contains 3 blue and 4 red balls, What is the probability that the ball taken out randomly will be red?

A box contains 3 blue and 4 red balls . What is the probability that the ball taken out randomly will be red?

One box contains 7 red balls and 5 blue balls. Another box contains 5 yellow and 9 green balls. What is the probability of getting blue balls from the first box?

One box contains 7 red balls and 5 blue balls. Another box contains 5 yellow and 9 green balls. What is the probability of getting red balls from the first box?

One box contains 7 red balls and 5 blue balls. Another box contains 5 yellow and 9 green balls. What is the probability of getting green balls from the second box?

One box contains 7 red balls and 5 blue balls. Another box contains 5 yellow and 9 green balls. What is the probability of getting yellow balls from the second box?

A bag contains 6 red and 5 blue balls. One ball is drawn at random. The probability that the ball is blue is:

From a box containing some red balls and some blue balls the probability of getting a red ball is a/b . What is the probability of getting a blue ball?.