Seven white and 3 black balls are placed in a row. What is the probability if two black balls do not occur together ?

Seven white balls and three black balls are randomly placed in a row. What is the probability that no two black balls are placed adjecently ?

Seven white balls and three black balls are randomly placed in a row. The probability that no two black balls are placed adjacently equals

Seven white balls and three black balls are randomly placed in a row. IF the parabability that no two black balls are placed adjacently, equals (7/a), then the value of "a" is

Seven white balls and three black balls are randomly placed in a row. The probability that no two black balls are placed adjacently equals a. 1//2 b. 7//15 c. 2//15 d. 1/3

Seven white balls and three black balls are randomly arranged in a row. The probability that no two black balls are placed adjacently is

A bag contains 5 red, 6 white and 7 black balls. Two balls are drawn at random. what is the probability that both balls are red or both are black?

An urn contains 9 red, 8 white and 4 black balls. A ball is drawn at random. What is the probability that ball drawn is white or black ?

A urn contains 9 red, 7 white and 4 black balls. A ball is drawn at random. What is the probability that the ball drawn will be: white or black.