Answer:
4n-1
Step-by-step explanation:
The difference in the numbers is 4 so the coefficient must be 4 for the nth term meaning
4n
11 is the third term however we need to find the first so..
11=3rd term
-4
7=2nd term
-4
3=1st term
now we need to minus 4 from 3 which is -1 (3-4)
meaning the answer put together will be 4n-1
