Probability of the Same Colour

In a box, there is a jumble of 7 red balls, 6 blue balls, 5 green balls, and 4 yellow balls. What is the minimum number of balls, will you have to pick up so that you have at least 4 balls of the same colour?




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Oedipus, the king of Thebes, figured out the answer to the riddle:

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A dead body is found outside a multi-story multinational company. The case is reported and a homicide detective is called on the crime scene.

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The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?

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Amazing Facts

Challenging

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