A temporary cofferdam is to be built to protect the 5-year construction activity for a major cross-valley dam. If the cofferdam is designed to withstand the 20-year flood, what is the probability that the structure will be overtopped (a) in the first year, (b) in the third year exactly, (c) at least once in the 5-year construction period, and (d) not at all during the 5-year period?
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