3. (27th American High School Mathematics Examination) The lines $L_{1}, L_{2}, \cdots, L_{100}$ are distinct, and all the lines $L_{4 n}$ are parallel to each other ($n$ is a positive integer), and all the lines $L_{4 n-3}$ pass through a known point ($n$ is a positive integer). The maximum number of points of intersection in the entire set is $\qquad$ .
3. B. The number of intersection points is $C_{100}^{2}-C_{25}^{2}-\left(C_{25}^{2}-1\right)=4351$, so the answer is B.