If Ti is the time of the ith event, Pr(T2 > 3) represents what probability?

• A. The probability of observing at least two events by t = 3.
• B. The probability of observing exactly two events by t = 3.
• C. The probability of observing at most one event by t = 3.
• D. The probability that the second event occurs exactly at t = 3.

Answer: (C)