Interview Question: Can You Count?

Sample Question #70 (mathematical brainteaser)

Which of the following two intervals contains more numbers:  (0,1) or [2,3)?

Alternative version: Are there more numbers greater than 10 than between 0 and 10?

(Hint: what’s a "number"?)

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One Response to Interview Question: Can You Count?

  1. Brett says:

    Non-math people think of numbers as natural numbers (1, 2, 3, …), but the general concept of numbers is much more than that. For instance, 1.3 is a number, but so is i. So the answer to both question is "they contain the same amount of numbers." 

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