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Just a tiny addition (Posted on 2014-11-18) Difficulty: 2 of 5
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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