Varun is guessing which of the 2 hands holds a coin. what is the probability that varun guesses correctly three times in a row ?

A Coin is tossed five time. What is the probability that heads are observed more than three times?

A fair coin is tossed 5 times . Find the probability that it shows exactly three times head.

A fair coin is tossed four time. What is the probability that at most three tails occur?

A Fair coin is tossed 5 times , find the probability that a) coin shows exactly three times head b) no head.

A combination lock on a suitcase has 3 wheels, each labelled with nine digits from 1 to 9. If an opening combination is a particular sequence of three digits with no repeats, what is the probability of a person guessing the right combination ?

In tossing three coins at a time, what is the probability of getting at most one head ?

The probability of guessing the correct answer to a certain question is (x)/(2) .If the probability of not guessing the correct answer to a question is (2)/(3) then find x