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Monday, October 19, 2015

Problem of the Week

Good morning from the Center of Math! We don't have the hourly traffic report, but we do have this week's new Problem of the Week.

I've written up my answer to this one below...

Did you come up with another way to solve this? Can  you figure out how many 7-digit phone numbers there are with this property? Tell us in the comments and be sure to stay tuned for more Problems of the Week!

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