Please help me solve these. Problem 1: In 2006, 86% of U. S. households had cable TV. Choose 3 households at random. Find the probability that
a) None of the 3 households had cable TV
b) All 3 households had cable TV
c) At least 1 out of 3 households had cable TV

Problem 2: A coin is tossed 3 times. Find the probability of getting at least 1 tail.

Problem 3: A coin is tossed 5 times. Find the probability of getting at least 1 tail.

Problem 4: A medication is 75% effective against a bacterial infection. Find the probability that if 12 people take the medication, at least 1 person's infection will not improve.

Problem 5: Urn 1 contains 5 red balls and 3 black balls. Urn 2 contains 3 red balls and 1 black ball. Urn 3 contains 4 red balls and 2 black balls. If an urn is selected at random and a ball is drawn, find the probability it will read.