Of four agents Alpha, Beta, Gamma and
Delta, three have to be sent together on a
mission. If Alpha and Beta cannot go
together, Beta and Gamma cannot go together
and Gamma and Delta cannot go together,
then which of the following holds?
1. Any three agents can be sent.
2. Alpha, Delta and any one out of Beta and
V Gamma can be sent.
3. Beta, Gamma and any one out of Alpha
and Delta can be sent.
4. The mission is impossible.