Mental Floss

Brain Game: Do Ya Feel Lucky?

By BY
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Sure, you can use a spreadsheet to figure out today's Brain Game. But try it without it any help. It'll be good for you. Like spinach.

Considering all the integers between zero and 777,777 would you find more instances of the number 3 or the number 7?

Click here for the answer.

ANSWER: THREE would be used more. The easiest way to understand this is to remember that all one hundred thousand of the numbers between 300,000 and 399,999 will contain at least one three. This isn't true with seven, since the numbers end at 777,777.

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