From a set of 17 cards, numbered 1, 2, 3, 4, .... ,16, 17, one is drawn at random. Show that the chance that its number is divisible by 3 or 7 is `7/17`.

12 tickets are numbered from 1 to 12 one ticket is drawn at random, then the probability of the number to be divisible by 2 or 3 is:

A decimal numeral from (0,1,2,3,4,5,6,7,8,9) is selected at random. Find the chance it is a prime number.

20 cards are numbered from 1 to 20. One card is then drawn at random. What is the probability that the number on the card will be : divisible by 5?

20 cards are numbered from 1 to 20. One card is then drawn at random. What is the probability that the number on the card will be : odd?

20 cards are numbered from 1 to 20. One card is then drawn at random. What is the probability that the number on the card will be : not a multiple of 6?

20 cards are numbered from 1 to 20. One card is then drawn at random. What is the probability that the number on the card will be : greater than 12?

Out of (2n+1) tickets consecutively numbered, three are drawn at random. Find the chance that the numbers on them are in AP.

20 cards are numbered from 1 to 20. One card is then drawn at random. What is the probability that the number on the card will be : a multiple of 4 ?

Box 1 contains three cards bearing numbers 1, 2, 3; box 2 contains five cards bearing numbers 1, 2, 3,4, 5; and box 3 contains seven cards bearing numbers 1, 2, 3, 4, 5, 6, 7. A card is drawn from each of the boxes. Let x_i be the number on the card drawn from the ith box, i = 1, 2, 3. The probability that x_1, x_2, x_3 are in an aritmetic progression is

A bag contains 20 cards numbering from 1, 2, 3......20. One card is drawn from the bag. Find the probability that it has a prime number on it.