The 3-person jury makes its decisions based on majority rule. Jurors \(A\) and \(B\) each have probability \(p\) of making the right decision, while Juror \(C\) has a probability of \(\frac{1}{2}\) of making the right decision. The cases where they make the right decision are as follows (where \(R\) represents a right decision, and \(W\) represents a wrong one):
| Juror A | Juror B | Juror C |
|---|---|---|
| R | R | R |
| R | R | W |
| R | W | R |
| W | R | R |
Summing the probabilities of these 4 individual cases gives:
\[\frac{p^2}{2} + \frac{p^2}{2} + \frac{p(1-p)}{2} + \frac{p(1-p)}{2} = p\]
Thus, the 1-person and 3-person juries both have the same probability of making the right decision.