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by sanju09 » Wed Sep 15, 2010 9:34 pm
If d is the average (arithmetic mean) of a, b and c, then c =
(A) 3 d – a – b
(B) 3 d – a + b
(C) d – 3 a – 3 b
(D) d – 3 a + 3 b
(E) (a + b)/ (3 d)



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by Rahul@gurome » Wed Sep 15, 2010 11:00 pm
d = (a + b + c)/3 implies 3d = a + b + c
Therefore, c = 3d - a - b

The correct answer is [spoiler](A)[/spoiler].
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