25. If G delivers the third lecture, then which of the following is true ?

1. L is only one of the five researchers who can take the first lecture

2. J is only one of the five researchers who can take the second lecture

3. Any one of exactly three of the five researchers can take the second lecture

4. Either one of exactly two of the five researchers can take the fifth lecture

Correct Answer :

Either one of exactly two of the five researchers can take the fifth lecture