Posted by Babueddie on Friday, January 20, 2012 at 7:41pm.
a+12d = 27 , (#1)
a+6d = 3(a+d)
a+6d = 3a + 3d
3d = 2a
then 12d = 8a
in a+12d = 27
a + 8a = 27
9a = 27
a = 3
first term is 3
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