Ball in Bag

A bag contains 64 balls of eight different colours. There are eight of each colour (including red). What is the least number you would have to pick, without looking, to be sure of selecting 3 red balls?




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= 10 cent x 10 cent
= 1/10 dollar x 1/10 dollar
= 1/100 dollar
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=> 1 dollar = 1 cent

solve this tricky problem?

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There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.