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The Brainliest Answer!
2014-04-20T15:54:26+05:30
Let the terms be as a-5d,a-3d,a-d,a+d,a+3d and a+5d
there sum
a-5d+a-3d+a-d+a+d+a+3d+a+5d=27
6a=27
a=9/2
sum of first three terms is 
3a-9d=0
a=3d
d=3/2
So the terms are -3,0,3,6,9,12

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