Number on the Bottom

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?




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We have arranged an array of numbers below. What you have to do is use any kind of mathematical symbol you know excluding any symbol that contains a number like cube root. You can use any amount of symbols but you have to come up with a valid equation for all of them.

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1 1 1 = 6
2 + 2 + 2 = 6
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5 5 5 = 6
6 6 6 = 6
7 7 7 = 6
8 8 8 = 6
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