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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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Solution re(2): digit 3? | Comment 3 of 5 |
(In reply to re: digit 3? by Benny)

!
  Posted by broll on 2014-11-18 23:48:20

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