Question

Find the sum of the first 25 terms of an AP whose nth term it's given by tn=7-3n

Answer 1

Your answer is in the attachment!!

Hope it helps you!!

Answer 2

Answer:

Step-by-step explanation:

To Sn of A25

Given

An=7-3n

Let n=1

Then A1=7-3=4

When n=2

A2=7-6=1

Therefore A=4,d=-3

A25= A+24d

4 +24.-3=-68

Is the ans.