Question

if the sum of first n terms of an ap is given by sn=n^2+3n then the first term of ap is

Answer 1

Step-by-step explanation:

given,

the sum of n terms of an a.p is n²+3n

sum of 1 terms is 1 st term is 1²+3(1)= 4

so first term of the A.P IS 4