Question: A temporary cofferdam is being designed to protect a 5-yr construction project from the 25-yr flood. What is the probability that the cofferdam will be

A temporary cofferdam is being designed to protect a 5-yr construction project from the 25-yr flood. What is the probability that the cofferdam will be overtopped?
(a) At least once during the 5-yr project,
(b) Not at all during the project,
(c) In the first year only,
(d) In the fourth year and fifth years exactly?

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