There are 15 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 choice from the following answers:
A) 272  B) 167  C) 157  D) 352  E) 380
The total number of stations = 17   From 17 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 17P₂ ways.   17P₂ = 17 * 16= 
<gadget id="calculator">17 * 16</gadget>
<output>272</output>
272.   272nswer: 272
<result>A</result>
There are 15 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?