There are 18 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) 277
C) 786
D) 791
E) 380
The total number of stations = 20   From 20 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 20P2 ways.   20P2 = 20 * 19= 
<gadget id="calculator">20 * 19</gadget>
<output>380</output>
380.   Answer: 380
<result>E</result>
There are 18 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?