Experienced students may serve as mentors if they are at least age 21 and have at least 3 years of post-secondary education. In cell L2, enter a formula using the IF and AND functions and structured references as follows to determine if Kay Colbert is eligible to serve as a mentor:

The IF function should determine if the student's age is greater than or equal to 21 AND the student's post-secondary years are greater than or equal to 3, and should return the text Yes if a student meets both of those criteria or the text No if a student meets none or only one of those criteria.

Fill the formula into the range L3:L31, if necessary.

What is the problem in my Formula.