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Combine the three numbers in each group to get the same result in each of the three groups. You can use addition, subtraction, multiplication, division, and exponentiation.

Group 1: $3, 17, 21$

Group 2: $16, 20, 34$

Group 3: $27, 30, 39$

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What have you tried so far? –  Ian Coley Apr 14 '13 at 17:04
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Why did this get changed, invalidating Jonas12's solution? –  Ross Millikan May 15 '13 at 18:03
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2 Answers

this seems to work

$21*17+3=360$

$20(34-16)=360$

$30(39-27)=360$

is there any tecnique

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17 here seems to be a critical value appearing in the 1st two and partially in three –  Jonas12 Apr 14 '13 at 17:37
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14/(2+5)=2;38/(29-10)=2;(43+31)/37=2

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