Question

How do you find the fourth term in the following recursively defined sequence given `a_1 = 4` and `a_n = a_(n-1) + 2`?

Answer 1

`a_4=10`.

Explanation:

It is enough to apply the sequence four times.

`a_1=4`
`a_2=a_1+2=6`
`a_3=a_2+2=8`
`a_4=a_3+2=10`.