Hi All,
The probability 'math' behind this question is fairly low-level, so most Test Takers could probably handle it without too much trouble. However, if you're not great at dealing with probabilities yet, the numbers involved in this question are so small that you could 'map-out' all of the possibilities. In that way, "brute force" can get you the correct answer rather quickly.
Since the probability of having a girl is identical to the probability of having a boy, we don't have to do anything special with the math. The possible outcomes for having 3 children are:
B=Boy, G=Girl
BBB
BBG
BGB
GBB
GGG
GGB
GBG
BGG
The question asks for the probability of having 3 children that are ALL the SAME gender (meaning all boys or all girls):
Total possibilities = 8
Total with 3 boys or 3 girls = 2
2/8 = 1/4
Final Answer:
GMAT assassins aren't born, they're made,
Rich
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