perplexus.info :: Just Math : Just a tiny addition

Just a tiny addition (Posted on 2014-11-18)

Wihout changing the order, add a single digit or a mathematical sign (but not both) to make true the expression below:

(71-1)*(71+1)=7

See The Solution Submitted by Ady TZIDON

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digit 3?

| Comment 1 of 5

71 - 1 is a multiple of 7

713 + 1 is a multiple of 7

Posted by Benny on 2014-11-18 23:44:49

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