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No multiplication allowed (Posted on 2013-10-17) Difficulty: 3 of 5
Below are four groups of three numbers each.

Combine the numbers in each group using only addition, subtraction, division, exponentiation, factorials and brackets so that each triplet yields the same result (there might be several solutions):

a. 2,7,8
b. 2,5,26
c. 3,11,15
d. 3,49,71

Inspired by "e pluribus unum" 2003 & 2004.

See The Solution Submitted by Ady TZIDON    
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Question Which one do you miss? | Comment 6 of 8 |
See my hint!
Which  one do you miss?

  Posted by Ady TZIDON on 2013-10-21 18:31:43
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