Can someone explain how to answer these 3 math problems:

1. If 6 fair coins are flipped, what is the probability that at least one of the coins will land with tails facing up?

2. A person is rolling a fair, six-sided die until they roll a 5. What is the probability that it takes them at least two

attempts to roll their first 5?

3. During heavy rain, a basement’s three pumps (pump A, pump B, and pump C) must all function correctly, or the

basement will flood. If the pumps’ probabilities of working are 33%, 60% and 86% respectively, what is the probability

that the basement will flood? (Assume the pumps work independently)