There are 14 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?
Pick:
A) 288  B) 267  C) 261  D) 211  E) 240
The total number of stations = 16   From 16 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 16P₂ ways.   16P₂ = 16* 15= 
<gadget id="calculator">16* 15</gadget>
<output>240</output>
240.   Answer: 240
<result>E</result>
There are 14 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?