12 defective pens are accidentally mixed with 132 good ones. It is not possible to just look at a pen and tell whether or not it is defective. One pen is taken out at random from this lot. Determine the probability that the pen taken out is a good one.

Five defective bulbs are accidentally mixed with 20 good ones. It is not possible to just look at a bulb and tell whether or not it is defective. Find the probability distribution of the number of defective bulbs if 3 bulbs are drawn at random.

A basket contains 20 apples and 10 oranges out of which 5 apples and 3 oranges are defective. If a person takes out 2 at random what is the probability that either are apples or both are good ?

A bag contains 3 red , 3 white and 3 green balls. One ball is taken out of the bag at random. What is the probability that the ball drawn is - red.

A bag contains 3 red, 3 white and 3 green balls. One ball is taken out of the bag at random. What is the probability that the drawn is red

A bag contains 3 red, 3 white and 3 green balls. One ball is taken out of the bag at random. What is the probability that the drawn is not red

A bag contains 3 red , 3 white and 3 green balls. One ball is taken out of the bag at random. What is the probability that the ball drawn is - either red or white.

A bag contains 3 red, 3 white and 3 green balls. One ball is taken out of the bag at random. What is the probability that the drawn is either red or white.

Four defective oranges are accidentally mixed with sixteen good ones . Two oranges are drawn at random from the mixed lot. If the random variable X denotes the number of defective oranges then find the values of X and number of points in its iverse image.

Three rotten eggs are mixed with 12 good ones. One egg is chosen at random. What is the probability of choosing a rotten egg ?