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How many 9′s are there between 1 and 100?

What do the numbers 11, 69, and 88 all have in common?

Dean Sam and Castiel are three brothers. Interestingly their current age is prime. What's more interesting that difference between their ages is also prime. How old are they?

I have 10 red socks and 10 blue socks in a drawer. How many socks must I take out to ensure that I have at least one matching pair? One how many to ensure I have at least a pair of red and a pair of blue?

Glittering points that downward thrust. Sparkling spears that do not rust. What is it?

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