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Posted by **sapna** on Saturday, December 15, 2012 at 9:41am.

- maths --plse help me.. -
**Steve**, Saturday, December 15, 2012 at 10:49ambecause 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