Game of Cards

13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?




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In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
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Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

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Amazing Facts

Gambling

In Canada, a mathematical puzzle must be solved in order to win the lottery to classify it as a “game of skill” not gambling.