Ten cards numbered 1 to 10 are placed in a box, mixed up thoroughly and then one card is drawn randomly. If it is known that the number on the drawn card is more than 3, what is the probability it is an even number?

Tickets numbered 1 to 30 are mixed up together and then a ticket is drawn at random. What is the probability that the ticket drawn will be a multiple of 7?

A card is drawn at random from a well- shuffled pack of 52 playing cards. What is the probability of getting a black card ?

A card is drawn at random from a well- shuffled pack of 52 playing cards. What is the probability of getting no heart ?

A card is drawn at random from a well- shuffled pack of 52 playing cards. What is the probability of getting a king ?

The following table shows the probability of selecting the boxes A, B and C and the number of balls of different colours contained in them. A box is selected at random and a ball is drawn from it. If it is given that the ball drawn is green, then the probability that it has come from box C is

There are 30 tickets numbered from 1 to 30 in a box and a ticket is drawn at random. If A is the event that the number on the ticket is a perfect square, then write the sample space S, n(S), the event A and n(A).