Question

Sequence: 15,19,23,27,… 15 , 19 , 23 , 27, =−1 a n = a n − 1 ? ? 1= a 1 = ?

Answer 1

`a_n=4n+11`

Explanation:

Common difference is
`d=4` with the first term being
`a_1=15`:

`a_n=a_1+(n-1)d\\a_n=15+(n-1)(4)\\a_n=15+4n-4\\a_n=4n+11`