An owner of a small hotel with 5 rooms is thinking of buying T.V. sets to rent them to room occupants when demanded. He expects that about half of his customers will be willing to get sets on rent. He buys three T.V. sets. Assuming 100% occupancy at all times, find out the probability that: some demand will be refused.

An owner of a small hotel with 5 rooms is thinking of buying T.V. sets to rent them to room occupants when demanded. He expects that about half of his customers will be willing to get sets on rent. He buys three T.V. sets. Assuming 100% occupancy at all times, find out the probability that: a customer who requests for T.V. will get one.