5
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Use 2,3,4,5 and + - * / only once each (it's not necessary to use all of them) to equal 26. I know 2 answers, but there is a 3rd (or more) :)

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9
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One:

24 + 5 - 3

Two:

25 + 4 - 3

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  • $\begingroup$ thank you! This was the 2 I knew, but I figured out the 3rd :) $\endgroup$ – Consultant Jun 14 '18 at 20:18
  • $\begingroup$ @Consultant If concatenation is available to make “25”, this should also be legal: 2 concat (5+4-3). $\endgroup$ – Lawrence Jun 15 '18 at 12:05
7
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So I figured out the 3rd one I did not know :)

$(3/2+5)\times 4=26$

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  • $\begingroup$ What happened to spoiler? $\endgroup$ – paparazzo Jun 22 '18 at 0:26
0
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A little bit of cheating leads me to:

$5^2 +(4-3)=26 $

A second answer is:

$5*(3*2)-4$

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  • 2
    $\begingroup$ the second answer is not good, because it contains 2 multiplications. thank you :) $\endgroup$ – Consultant Jun 14 '18 at 20:18

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