There are 13 stations between Hyderabad and Bangalore. How many second class tickets have to be printed, so that a passenger can travel from any station to any other station?	Choose the most appropriate option:  A) 288  B) 267  C) 261  D) 211  E) 210

Rationale: "the total number of stations = 15 from 15 stations we have to choose any two stations and the direction of travel ( i . e . , hyderabad to bangalore is different from bangalore to hyderabad ) in 15 p ₂ ways . 15 p ₂ = 15 * 14 = 210 . answer : e"
Answer: E