Question

SUM OF N TERMS OF H.P.

Answer 1

HERE IS YOURS ANSWER;

◆ Since 1/AP = HP

So, the formula is:

∆◆ 1/Sn = 2/n [1/2a + 1/(n-1)d]

&

∆◆ 1/Sn = 2/n ( 1/a+1/l )

HOPE IT HELPS