A pair of unbiased dice are rolled together till a sum of “either 5 or 7” is obtained. Then find the probability that 5 comes before 7.

A die is thrown twice. Find the probability that: 5 will not come up either time

A unbiased coin is tossed. If the result is a head a pair of unbiased dice is rolled and the sum of the numbers obtained is noted. If the result is a tail, card from a well shuffled pack of eleven cards numbered 2, 3, 4, ………12 is picked and the number on the card is noted. What is the probability that the noted number is either 7 or 8?

Dice is rolled twice. If sum of the two numbers obtained is a multiple of 4.Find the conditional probability that 4 occurs atleast once.

A pair of unbiased dice is rolled simultaneously. Find the probability of getting a difference of three.

Two unbiased dice are rolled. What is the probability of getting a sum which is neither 7 nor 11 ?

If two unbiased dice are rolled, find the probability that the total score is a prime number.

A pair of dice is thrown until either a sum of 4 or 6 appears. Find the probability that a sum of 8 occurs first.