A lot contains 50 defective and 50 non-defective bulbs. Two bulbs are drawn at random one at a time with replacement. The events A, B and C are defined as the first bulb is defective, the second bulb is non-defective, the two bulbs are both defective or non-defective, respectively. Then,

5% of the electric valves are defective. 10 valves are drawn at random. Find the probability that at least two defective valves are found.

5% of the electric values are defective. 10 values are drawn at random. Find the probability that at least two defective values are found.

A lot contains 36 ariticles of which 6 are defective A sample of 5 articles was drawn at random (i) without replacement (ii) with replacement find the probalitiy distribution of x the number of defectives

From a lot of 25 ariticles containing 5 defective a sample of 4 aritcles was drawn at random (a) without replacement (b) with replacement find the probability distribution of x the number of defectives

A bag contains 6 red and 4 balls. Two balls are drawn at random one after the other.Find the probability that both the drawn balls are white, when (i) the first drawn ball is not replaced before the second drawing, (ii) the first drawn ball is replaced before the second drawing.

An urn contains 4 red and 7 black balls. Two balls are drawn at random with replacement. Find the probability of getting (a) 2 red balls (b) 2 black balls (c ) one red ball and one black ball.

A lot of 20 bulbs contain 4 defective ones. One bulb is selected at random from the lot. What is the probability that this bulb is defective? Suppose the bulb selected in previous case is not defective and is not replaced. Now one bulb is selected at random from the rest. What is the probability that this bulb is not defective?

From a lot of 30 bulbs which include 6 defectives, a sample of 4 bulbs is drawn at random with replacement. Find the probability distribution of the number of defective bulbs.

In a lot of 25 articles, 5 are defective. Four articles are drawn at random from the lot. Find the probability that exactly 2 of the drawn articles are defective.

Ten eggs are drawn successively with replacement from a lot containing 10% defective eggs. Find the probability that there is at least one defective egg.