Question
The king comes from a family of 2 children. What is the probability that the other child is his sister?
Step 1
They can be either both boys (BB), both girls (GG), a boy and a girl (BG), or a girl and a boy (GB). We assume that each of these possibilities is equally likely, so each has a probability of 1/4. Show more…
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The king has only one sibling. What is the probability that the sibling is male? Assume that every birth results in a boy with probability 1/2, independent of other births. Be careful to state any additional assumptions you have to make in order to arrive at an answer.
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