Question

if the sum of n terms of an ap is 3n2-5 find the third term of this ap​

Answer 1

Answer:

sum of the n term of an ap is 3n^2-5

sum of the 3 terms of the ap is

3*3^2-5=3*9-5=27-5=22

sum of the 2 terms of the ap is

3*2^2-5=3*4-5=12-5=7

so the 3 rd term is (22-7)=15

Answer 2

Answer:

thanks for ffollowing me