If 3 tickets are drawn randomly from 2n tickets numbered 1, 2, 3,………,2n, find the probability that the numbers on the chosen tickets are in arithmetic progression.

One ticket is selected at ransom form 50 tickets numbered 00,01,02,…,49. Then the probability that the sum of the digits on the selected ticket is 8, given that the product of these digits is zero, is

In a lottery of 50 tickets numbered 1 to 50, one ticket is drawn. Find the probability that the drawn ticket bears a prime number.

Out of 21 tickets marked with numbers , from 1 to 21 , three are drawn at random, find the probability that the three numbers on them are in A.P.

A number is chosen at random from the numbers 1, 2,…, 15. find the probability that the chosen number is (i) even (ii) odd and (iii) multiple of 3.

Out of (2n +1) tickets cosecutively numbered, three are drawn of random, find the probability that the three number on them are in A.P.

An um contains 30 tickets numbered 1 to 30 two tickets are drawn at random the probability that both the numbers are prime is

If from the numbers 1,2,3… 30 three are drawn at randomm find the probability that they are in G.P.

The nth term of an arithmetic progression is 3n-1. Find the progression.

Find the probability that a randomly chosen three-digit number has exactly three factors.

The box contains tickets numbered from 1 to 20. Three tickets are drawn from the box with replacement. The probability that the largest number on the tickets is 7 is a. 2//19 b. 7//20 c. 1-(7//20)^3 d. none of these