There are 28 stations between Kolkatta and Chennai. 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 options.
A) 870	B) 970	C) 1070	D) 1000	E) 800
The total number of stations = 30   From 30 stations we have to choose any two stations and the direction of travel (i.e., Kolkatta to Chennai is different from Chennai to Kolkatta) in 30P2 ways.   30P2= 30 * 29= 
<gadget id="calculator">30 * 29</gadget>
<output>870</output>
870   870NSWER: 870
<result>A</result>
There are 28 stations between Kolkatta and Chennai. How many second class tickets have to be printed, so that a passenger can travel from any station to any other station?