if the AM between mth and nth term of an AP be equal to AM between pth and qth terms of the AP then prove that m+n=p+q

am a m 1 dan a n 1 d a p a p 1 daq a q 1 dAM of mth term and n th term AM of p th term and q th terma m 1 d a n 1 d a p 1 d a q 1 d 22 a m 1 d a n 1 d a p 1 d a q 1 d m 1 d n 1 d p 1 d q 1 d…