Question

arithmetic program a n = 2 n + 1 what is the answer​

Answer 1

an=2n+1

a1 = 2(1)+1 = 3

a2 = 2(2) +1 = 5

a3= 2(3)+1 = 7......

a = 3

d = 5-3 = 2

therefore an= 3,5,7..........n

Answer 2

a n= 2n+1

For n =1

we have

a1 =2(1)+1=2+1

a1 =3

For n =2

we have

a2 =2(2)+1=4+1

a2=5

therefore

d =a2- a1

d=5+3

d=8