A box contains 40 envelopes of which 25 are ordinary (not meant for air mail ) and 16 are unstamped, while the number of unstamped ordinary envelopes is 10. What is the probability that an envelope chosen from the box is a stamped air mail envelope?

There are 10 envelopes and 10 letters to go inside them. Each letter is meant for a specified envelope only. What is the probability that exactly 9 of them are in the right envelopes ?

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 10 black beads and 15 white beads Another box contains 11 black beads and 17 white beads Without looking, a bead is drawn from each box i) What is the probability of getting a black bead from the first box? ii) What is the probability of getting a black bead from the second box? iii) Which box give more chance to get a white bead Why?

A box contains 10 identical electronic components of which 4 are defective. If 3 components are selected at random from the box in succession, without replacing the units already drawn, what is the probability that two of the selected components are defective ?

A box contains slips numbered prime numbers from 1 to 10 and another box contains odd numbers from 1 to 10 . If one slips taken from each. a) What is the probability of both being prime numbers?

There are 10 marbles in a box which are marked with the distinct numbers from 1 to 10. If a marble is drawn, then what is the probability of getting prime numbered marble ?

There are 10 marbles in a box which are marked with the distinct numbers from 1 to 10. If a marble is drawn, then what is the probability of getting a marble being a number multiple of 3 ?