first term =36
second term=69
So common difference=69-36=33
checking. 69+33=102
36=3+33
so the series in AP Becomes as...
(3+33) ,(36+33) ,(36+2(33)) ... (36+7(33))
So The Answer is...
(refer above attachment.)
Hope it helps...
Regards,
Leukonov/Olegion.
