explain the whole solution especially that part in which we put n=23 we do we do that
Dear student,
In first step we put the formula of sum of n for two APs.
In second step both 2 get cancelled.
And formula of n terms for two APs.
We take n = 23 to compare with equation (1), so that both become exact same.
This is HIT and TRIAL method for solving these type of questions.
Regards
In first step we put the formula of sum of n for two APs.
In second step both 2 get cancelled.
And formula of n terms for two APs.
We take n = 23 to compare with equation (1), so that both become exact same.
This is HIT and TRIAL method for solving these type of questions.
Regards