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Home  >>  JEEMAIN and AIPMT  >>  Mathematics  >>  Class11  >>  Sequence and Series
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If the sum of n terms of the AP 55, 57, 59------ is equal to the sum of first 2n terms of the AP 1, 4, 710--------then n equals

$\begin{array}{1 1}100 \\ 12 \\ 11 \\ 13\end{array}$

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Answer : (c) 11
Explanation : Sum of 2n terms of AP 1,4,7----
Sum of n terms of AP 55,57,59--------
answered Jan 2, 2014 by yamini.v
edited Jan 24, 2014

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