Among the digits 1, 2, 3, 4, 5 first one is chosen, and then a second selection

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Among the digits 1, 2, 3, 4, 5 first one is chosen, and then a second selection is made among the remaining four digits. Assume that all twenty possible re- sults have the same probability. Find the probability that an odd digit will be selected

(a) the first time,

(b) the second time,

(c) both times.

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