Posted by Watermelon on Saturday, December 3, 2011 at 10:23pm.
The consecutive terms of an arithmetic progression are 5x, 8, 2x. Find the common difference of the progression.

AP calculus  MathMate, Saturday, December 3, 2011 at 10:53pm
The common difference of an A.P. is constant, therefore, we can take the difference of consecutive terms and equate the values to determine x:
2x8 = 8  (5x) =>
2x  x = 85+8 =>
x = 11
or
common difference
=2x8
= 14
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