From `21` tickets numbered `1,2, 3.,., 21` one ticket is drawn at random. Find the probability that the ticket drawn has a number divisible by `3.`

A bag contains 25 tickets numbered 1,2,3....25. One ticket is drawn at random, then what is the probability that the ticket drawn has a prime number?

A bag contains 75 tickets numbered from 1 to 75. One ticket is drawn at random. Find the probability that: Number on the ticket is a perfect square or divisible by 4.

A box contains 36 tickets numbered from 1 to 36. One ticket is drawn at random. Find the probability that the number on the ticket is either divisible by 3 or a perfect square.

Tickets numbered from 1 to 20 are mixed up and a ticket is drawn at random. What is the probability that the ticket drawn has a number which is a multiple of 3 or 7?

Tickets numbered from 1 to 20 are mixed up and a ticket is drawn at random. What is the probability that the ticket drawn has a number which is a multiple of 3 or 7?

Tickets numbered from 1 to 20 are mixed up and a ticket is drawn at random.What is the probability that the ticket drawn has a number which is a multiple of 3 and 7?

Tickets numbered from 1 to 18 are mixed up and then a ticket is drawn at random. What is the probability that the ticket drawn has a prime number.

Tickets numbered from 1 to 20 are mixed up together and then a ticket is drawn at random. Find the probability that the ticket drawn has a number which is a multiple of 3 or 7.