
Three urns are given, each containing red and black balls as indicated below:
Urn
red and black balls
Urn
red and black balls
Urn
red and black balls
An urn is chosen at random and a ball is drawn from that urn. The ball drawn is red. The probability that the ball is drawn either from urn or from urn is given by . Find .

Important Questions on Probability

















A man speaks truth 2 out of 3 times. He picks one of the natural numbers in the set and reports that it is even. The probability that it is actually even is


A computer producing factory has only two plants and . Plant produces and plant produces of the total computers produced. of computers produced in the factory turn out to be defective. The probability that a computer turns out to be defective which is produced in plant is ten times of the computers produced in the plant . A computer produced in the factory is randomly selected and it does not turn out to be defective. Then the probability that it is produced in plant is

