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arithematic progression

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by shashank.ism » Tue Feb 09, 2010 1:03 pm
The sum of 3rd and 15th elements of an arithmetic progression is equal to the sum of 6th, 11th and 13th elements of the same progression. Then which element of the series should necessarily be equal to zero?

1st
9th
12th
6th
None of the above
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by papgust » Wed Feb 10, 2010 10:06 pm
Shashank,

Please don't post redundant questions. It's already addressed in Problem Solving forum.
https://www.beatthegmat.com/ap-gp-t52274.html
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