Question

if the nth term of an A.P is (4n+1) , find the sum of first 15th terms of this A.P. Also find the sum of its nth terms​

Answer 1

Step-by-step explanation:

The sum of its nth term is

The nth term of the AP is (4n+1). The sum of nth term of an ap is given by : The sum of the first 15 term of the AP is 495.