A box contains 13 bulbs out of which 5 bulbs are defective. 3 bulbs are drawn one by one from the box without replacement. Find the probability that exactly 2 bulbs are defective.

A box contains 16 bulbs out of which 4 bulbs are defective. 3 bulbs are drawn one by one from the box without replacement. Find the probability that all three are defective bulbs

Out of 250 bulbs in a box, 35 bulbs are defective. One bulb is taken out at random from the box. Find the probability that the drawn bulb is not defective.

There is a box containing 30 bulbs of which 5 are defective.If two bulbs are chosen at random from the box in succession without replacing the first,what is the probability that both the bulbs chosen are defective?

A box contains 16 bulbs, out of which 4 bulbs are defective. Three bulbs are drawn at random from the box. Let X be the number of defective bulbs drawn. Find the mean and variance of X.

A box contains 5 bulbs of which two are defective.Test is carried on bulbs one by one untill the two defective bulbs are found out. Find the probability that the process stops after

A lot of 20 bulbs contains 4 defective ones. One bulb is drawn at random from the lot. What is the probability that this bulb is defective?

Suppose there are three bags such that Bag A has 10 bulbs out of which 4 are defective. Bag B has 6 bulbs out of which 1 is defective Bag C has 8 bulbs out of which 3 are defective. A bag is chosen at random and then a bulb is randomly chosen from the chosen bag. (i) Find the probability that the bulbs is non-defective (ii) If the bulb is non-defectivem, find the probability that it came from bag C?