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Use +, -, /, * to prove 4__4__4__4 = 20

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It's a challenge...

4___4___4___4 = 20

Use +, -, /, * to solve it.

posted Jul 22, 2014 by anonymous

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Evaluate the following integral, and use the result to prove that π is less than 22/7.

enter image description here

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You might wonder, are there any other numbers like this, where their cube root is equal to the sum of their digits? Incredibly these are the only 7 such numbers! They are also known as Dudeney numbers.

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