Question

Answer please ! As fast as you can

Answer 1

Step-by-step explanation:

its option A 13

Hope it helps uh...

Answer 2

Answer:

sum of n terms of an AP is n(3n+4)

if we put n=1 then we get first term.

i.e. 7

now if we put n=2 then we get sum of first two terms.

i.e.2(3×2+4)=20

so 2nd term is 20-7=13

Now common difference will be 13-7=6

If my answer satisfies you then give me thanks.