Question

in a progression if a n is equal to 2 n square + 1 then s2 is​

Answer 1

a1 = 2+1 =3

a2 = 8+1 =9

therefore s2 = a1 + a2=3+9=12

hope u understood

pls mark as Brainliest..

Answer 2

Answer:

I think there is formula for it once I referred in a book