If there be 'm' A.P's beginning with unity whose common difference is 1,2,3......m. Show that the sum of their n^(th)nth terms is (m/2)(mn-m+n+1)(m2)(mn−m+n+1)?
1 Answer
Aug 28, 2017
The first AP series
The 2nd AP series
The 3rd AP series
The
So sum of nth terms of m AP series will be
Another approach
Here the number of terms for all nth terms of m AP series is
First term of the series
The common difference of the series
So applying formula