progressions

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progressions

by vaibhav101 » Mon Jun 04, 2018 9:22 am

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find the 4th A.M. inserted between 17 and 92 if there are 'n' arithmetic means such that $$a_r-a_{r-2}=10\ \left(r\ is\ less\ than\ n\right)$$

A 23
B 37
C 32
D 41
E none of these
Source: — Problem Solving |