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0 / 60 seg.
Mr. Jones has two children. The older child is a girl. What is the probability that both children are girls?
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Clue
THE KING GAVE THEM ALL FAKE SEEDS; HE CHOSE THE LITTLE GIRL WHO WAS HONEST AND DIDN'T SWITCH SEEDS
THE PROBABILITY IS 1/2. THERE ARE INITIALLY 4 POSSIBILITIES: GIRL-GIRL, GIRL-BOY, BOY-GIRL AND BOY-BOY. SINCE THE OLDER CHILD IS A BOY, WE CAN RULE OUT THE GIRL-GIRL AND GIRL-BOY COMBINATIONS
THE PROBABILITY IS 0.5. THE POSSIBILITIES ARE (GIRL, GIRL) AND (GIRL, BOY). SO THE PROBABILITY THAT BOTH CHILDREN ARE GIRLS IS 1/2 OR 0.5
21 GIRLS. 1 2 3 4 5 6 7 8 9 10 11 10 9 8 7 6 5 4 3 2 1
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