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posted by sapna Saturday, December 15, 2012 at 9:41am.
if a, b, c are in A.P. then solve that b+c-a,c+a-b,a+b-c are in A.P.
because of AP, c-b = b-a = d b+c-a = c+b-a = c+d = b+2d c+a-b = a+c-b = a+d = b a+b-c = a-d = b-2d
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