Question

please solve 7 question

Answer 1

Hi...dear..

..

here is your answer!!!...
...
let the first term of AP Be a and common difference be d ....
....
see picture!!!...
create two equations by Given conditions...
and solve the equations to find a and d ...

put a and d in fromula of sum of n terms of series!!!!!and answers will be (mn+1)/.....2


hope this helps you!!
Regards Brainly Star Community.
#shubhendu