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# Arithmetic Progressions Free Doubts and Solutions

## The sum of n terms of two A.P are in the ratio (3n+8):(7n+15).Find the ratio of there 12th terms.   [why is n=23 towards the ending of the solution and how do we find n in the question?]

Asked by Deebu 29th November 2014, 2:03 PM

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## In an A.P if mth term is n and nth term is m,where m =!(not equal to) n,find the pth term. I substituted for An=a+(n-1)d. (ie Am=a+(m-1)d and An=a+(n-1)d) I don't understand the rest.  Please explain the steps.

Asked by Deebu 28th November 2014, 6:25 AM