There are 12 stations between Ernakulam and Chennai. How many second class tickets have to be printed, so that a passenger can travel from one station to any other station? Choose the correct choice
A) 132	B) 145	C) 165`	D) 400	E) 300
The total number of stations= 12   From 12 Stations we have to choose any two stations and the direction of travel (Ernakulam to Chennai is different from Chennai to Ernakulam) in 12P2 ways.   12P2= 12*11= 870   132NSWER:132
<result>A</result>
There are 12 stations between Ernakulam and Chennai. How many second class tickets have to be printed, so that a passenger can travel from one station to any other station?