Problem: In triangle ABC the ratio AC:CB=3:4. The bisector of the exterior angle at C intersects BA extended at P ( A is between P and B). The ratio PA:AB is:
Answer Choices:
A. 1:3
B. 3:4
C. 4:3
D. 3:1
E. 7:1
Solution:
ABPA​=PB−PAPA​=4m−3m3m​=13​