Grade 12Algebra
Find the sum of the series
1.n+2.(n-1)+3.(n-2)+..........n.1
Find the sum of the series
1.n+2.(n-1)+3.(n-2)+..........n.1
1 Answer
Pratik Tibrewal
the r th term will be r(n-r+1)
it is summation of r(n-r+1) where r varies from 1 to n;
SUM ( (n+1)r - r^2 ) = (n+1)(n)(n+1)/2 - (n)(n+1)(2n+1)/6
Thanks and Regards,
Pratik Tibrewal
askiitians Faculty
Btech IITG
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