One coin is tossed twice. We know that all results in the sample space S are equipotent. The probability of Y ni S = {(Y, T), (Y, Y), (T, T), (T, Y)} is 1/4. Find the conditional probability of (Y, Y) if the following probabilities are known. a) If the result of the first shot is Y b) If it is known that the result of at least one shot is Y.

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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One coin is tossed twice. We know that all results in the sample space S are equipotent.

The probability of Y ni S = {(Y, T), (Y, Y), (T, T), (T, Y)} is 1/4. Find the conditional probability of (Y, Y) if the following probabilities are known.
a) If the result of the first shot is Y
b) If it is known that the result of at least one shot is Y.

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