【Question 13】There are 50 students in the third grade, all of whom choose to subscribe to one, two, or all three of the three magazines A, B, and C. Then at least $\qquad$ students have the same subscription type.
Analysis: Subscribing to 1 magazine has 3 cases: (A), (B), (C)
Subscribing to 2 magazines has 3 cases: (A, B), (B, C), (A, C)
Subscribing to 3 magazines has 1 case: (A, B, C)
There are a total of $3+3+1=7$ (types) of different magazine subscriptions.
$$
50 \div 7=7 \ldots 1
$$

Therefore, at least $7+1=8$ students have the same type of magazine subscription.