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Answer:
We know that there are 8 possible ways for the genders of the children to be. We know too that of those 8 ways, 2 are for where all three children are the same gender, leaving 6 ways.
Of those 6 ways, half will be for having 2 boys and 1 girl and the other half will be for having 2 girls and 1 boy.
For more details: https://socratic.org/questions/a-family-has-3-children-find-the-probabilities-a-all-boys-b-all-boys-or-all-girl#621064