To find out how many freshmen will be in each orientation session, you need to divide the total number of freshmen by the number of orientation sessions.
The calculation is:
\[ \text{Number of freshmen per session} = \frac{\text{Total number of freshmen}}{\text{Number of orientation sessions}} = \frac{3525}{15} \]
Now, perform the division:
\[ 3525 \div 15 = 235 \]
Therefore, each orientation session will include 235 freshmen.