Question

What is the common difference in this series?

Answer 1

I haven't seen index 2 before.

Answer 2

@SolomonZelman What do you mean?
Is the common difference 6?

Answer 3

The starting value is 2 and the ending value is 6. n(2)= 2(2)+3= 7
n(3)=2(3)+3=9, n(4)=2(4)+3=11 and so on. You can see the common difference is 2

Answer 4

@Venny Thank you so much :)