Assuming that all stations are occupied and all lines are observed in both directions, compute the strength of figure factor for a single triangle.

- 0.75
- 0.80
- 0.60
- 0.50

\[
c = (n’ – S’ + 1) + (n – 2s + 3)
\]
\[
c = (3 – 3 + 1) + [3 – 2(3) + 3]
\]
\[
c = (3 – 3 + 1) + (3 – 6 + 3)
\]
\[
c = 1
\]
\[
F = \frac{D – c}{D}
\]
\[
F = \frac{4 – 1}{4}
\]
\[
F = 0.75 \leftarrow \text{answer}
\]