Today Puzzle #628
Puzzle No. 628– Monday 9 December
A couple plans on having four children. Is it more likely they will have two boys and two girls, or three of one sex and one of the other?
Today’s #PuzzleForToday has been set by Alex Bellos, author of So You Think You’ve Got Problems: Suprising and Rewarding Puzzles to Sharpen your Mind
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There are 16 equally probable combinations of four children. BBBB, BBBG, BBGB, and so on. Six of these combinations have two boys and two girls. Eight have three of one and one of the other. So three and one is more likely than two of each.