1st exercise: Reverse grip cable triceps extension - lock your elbows close to your body and squeeze triceps in the contracted position
2nd exercise: Cable overhead triceps extension - get a good stretch of the triceps at the start of the lift. Once again squeeze triceps in the contracted position
3rd exercise: Dumbell biceps curl - use full range of motion, outwardly turn your forearm at the top of the exercise and squeeze the biceps
Try this combination for a great pump like I got. 3 sets will be enough.