Question Number 11399 by tawa last updated on 23/Mar/17

The sum of the first and last term of an A.P is 51. And the sum of the   progression is 255. Find the last term of the A.P.

Answered by ajfour last updated on 23/Mar/17

last term = (1/2)(51+9d)  where d is whatever common  diffeeence you choose..  number of terms n=10  The first term a= (1/2)(51−9d)

Commented bytawa last updated on 24/Mar/17

God bless you sir.