Question

19. The sum of n terms of an AP is (5n² - 3n). Find the AP and hence find its 10"ter.​

Answer 1

Answer:

I think it is not an A.P

Step-by-step explanation:

general of A.P=5n^2-3n

First term,

put n=1,

a=25-3

a=22

Second term,

put n=2,

a1=100-6

a1=94

Third term,

put n=3,

a2=225-9

a2=216