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Four Sevens

October 6, 2015 - Puzzles -

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As Dudeney shows in the illustration here, it is easy to use four 5s to create a sum that equals 100. He then points out that four 9s would also be fairly easy to do, in the form of 99 + 9/9. Achieving it with just four 7s is somewhat trickier. Can you manage it?

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