Difference Years 1B6743

1. The problem is to understand the difference between 4 years and 3 years and to shorten the expression. 2. We start by expressing the difference as a subtraction: $$4 - 3$$. 3. Calculate the difference: $$4 - 3 = 1$$. 4. The shortened form of "4 years not 3" is simply "1 year". 5. Therefore, the answer is 1 year.