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Anna likes 25 but not 24; she likes 400 but not 300; she likes 144 but not 145. Which does she like?
The right answer is: 1600
Anna obviously likes square numbers, and the only square number here is 1600 = 40x40.
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In his pocket, a boy has 3 red marbles, 4 blue marbles, and 4 green marbles. How many will he have to take out to ensure that he has taken out at least 1 of each color?