Question

(1) If the sum of n terms of an A.P. is 3n2 + 5n find its common difference.​

Answer 1

Answer: Sn = 3n2+5n

n/2[2a+(n-1)d]=3n2+5n

2a+(n-1)d=6n2+10/n

d=6n-2a+10/n-1

Answer 2

Answer:

hope my answer in the above attachment helps you