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From the article: "Here’s a simple yet revealing question to ask people at all levels of mathematical attainment: 'The answer is 10. What is the question?'"

I know I'd love to hear HN's answers.

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Here's one: How do you express the number of digits that exist in any given base, in that base?

A related comic which gives away the answer:

http://cowbirdsinlove.com/43

If you're using Arabic numerals, that is.

what is the binary representation of 2?

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