Final answer:
To find the number of graduate students at university A, subtract 23,000 from the number of undergraduate students, which is denoted as n.
Step-by-step explanation:
If the number of undergraduate students at university A is n, and it is known that the number of graduate students is approximately 23,000 fewer than the number of undergraduate students, we can use a simple subtraction to find the number of graduate students. The mathematical expression for this situation would be:
Number of Graduate Students = n - 23,000
Therefore, if you are given a specific number for n, simply subtract 23,000 from it to obtain the number of graduate students attending university A.