There are 16 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 correct option
A) 288  B) 267  C) 261  D) 211  E) 306
The total number of stations = 18   From 18stations we have to choose any two stations and the direction of travel (i.e., Hyderabad to Bangalore is different from Bangalore to Hyderabad) in 18P₂ ways.   18P₂ = 18* 17= 
<gadget id="calculator">18* 17</gadget>
<output>306</output>
306.   Answer: 306
<result>E</result>
There are 16 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?