Question: how to do a banjo roll?
Answer: Pluck the 2nd string with your index finger. Pluck the 1st string with your middle finger. Pluck the 5th string with your thumb. Pluck the 2nd string with your index finger. Pluck the 1st string with your middle finger. Pluck the 5th string with your thumb. Pluck the 2nd string with your index finger.