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0 / 60 seg.
In a certain city, 5% of all the persons in town have unlisted phone numbers. If you select 100 names at random from that city's phone directory, how many people selected will have unlisted phone numbers?
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Clue
NONE. AN UNLISTED PHONE NUMBER DOESN'T APPEAR IN THE PHONE BOOK
FIVE. THERE ARE ONLY FOUR COLORS, SO FIVE SOCKS WILL GUARANTEE THAT TWO WILL BE THE SAME COLOR
A HALF DOLLAR. REMOVE HALF AND YOU GET A DOLLAR
2581 = 2 THE ANSWER HAS TO DO WITH THE SUM OF THE NUMBER OF CIRCLES IN EACH NUMBER. SO THE NUMBER 0 HAS 1 CIRCLE, 6 HAS 1 CIRCLE, 8 HAS 2 CIRCLES AND 9 HAS 1 CIRCLE
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