Here is D, F, G and B. Beginning banjo pickers will want to play the B on the open second string. However, folks who are advancing more, or who just want an extra challenge, can also play the B on the fourth fret of the third string
Remember, scaffolding is available if you need help.
Don’t forget to do Musical Gym. It will help you internalize the ear training as well as increase your bowing and picking skills.