A room contains 3 sockets for bulbs. If from a collection of 10 bulbs, out of which 6 are defective, 3 bulbs are selected at random and put in the sockets, then the probability that the room is lighted is

A room has 4 sockets for electric lamps. From a collection of 11 light bulbs of which 6 are good, 4 bulbs are selected at random and put in the sockets. Find the probability that the room does not suffer from a complete black-out.

A room has 3 lamps . From a collection of 10 light bulbs of which 6 are no good , a person selects 3 at random and puts them in a socket . What is the probability , that he will have light ?

In a box there are 100 electric bulbs out of which 10 are defective. 5 bulbs are selected from it then ………..is the probability that bulb is defective.

Out of 100 bulbs in a box 10 bulbs are defective. Five bulbs are selected at random from it. Then find the probability of an event that selected bulb is of without defect.

3 bulbs are chosen at random from 20 bulbs , out of which 4 are defective . The probability that the room is illuminated will be

10 % bulbs are defective produced by some factory. 5 bulbs are selected at random then ……… is the probability that bulb is without defect.