There are 8 stations between Vijayawada and Chennai. How many second class tickets have to be printed, so that a passenger can travel from any station to any other station?  Options:
A) 100 B) 90 C) 190 D) 110 E) 105
The total number of stations = 10   From 10 stations we have to choose any two stations and the direction of travel (i.e.,Vijayawada to Chennai is different from Chennai to Vijayawada) in 10P2 ways.   10P2= 10 * 9= 
<gadget id="calculator">10 * 9</gadget>
<output>90</output>
90   ANSWER: 90
<result>B</result>
There are 8 stations between Vijayawada and Chennai. How many second class tickets have to be printed, so that a passenger can travel from any station to any other station?