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2014-03-12T12:45:05+05:30

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Let the no be a-6d,a-5d,a-4d,a-3d,a-2d,a-d,a-a+d,a+2d,a+3d,a+4d,a+5d,a+6d
s0
13a/13=324
so a=324
now 20 number
a-d,a+d,a-3d,a+3d,a-5d,a+5d,a-7d,a+7d,a-9d,a+9d,a+11d,a-11d,a+13d,a-13d,a+15d,    a-15d,a-17d,a+17d,a+19d,a-19d
so 
20a/2a=324
so a=324
1 1 1