A lot of 40 bulbs contain 10 defective one. 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 in not defective and is not replaced. Now one bulb is selected at random. from the test what is the probability that this bulb is not defective.

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?

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

One number is selected at random from 1 to 500. Find the probability that it is a perfect square.

One number is selected at random from 1 to 900. The probability that it is a perfect square is

One number is selected at random from 1 to 100. The probability that it is a prime number is

A box contains 100 electric bulbs. Out of them, 10 are defective bulbs. One bulb is taken out at random from this box. What is the probability that it is a non-defective bulb?

A bag contains 5 red balls and 7 black balls a ball drawn at random from the bag. What is the probability that the ball selected red .

A bag contains 5 red balls and 7 black balls a ball drawn at random from the bag. What is the probability that the ball selected not red.

A shopkeeper has 100 memory cards in a box. Among them 15 memory cards Are defective when a person came to the shop to buy a memory cards, the shopkeeper draw a memory card at random from the box then (i) What is the probability that memory card is defective? (ii) After drawing the first memory card which is defective, it is not placed back in the box”. Then what is the probability that this memory card is not defective.

A box contains 10 Telgu books and 15 English books. A book drawn at random from the box. What is the probability that the book selected Telugu