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Assuming boys and girls are equally likely, find the probability of a couple's last child being a baby boy. They have a total of 3

Assuming boys and girls are equally likely, find the probability of a couple's last child being a baby boy. They have a total of 3 children not including the last child in question and all were boys before the last child was born. Express your answer as a percentage rounded to the nearest hundredth without the % sign

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