There are 10 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 most appropriate option.
A) 156	B) 167	C) 132	D) 352	E) 380
The total number of stations = 12   From 12 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 12P₂ ways.   ²⁰P₂ = 12 * 11= 
<gadget id="calculator">12 * 11</gadget>
<output>132</output>
132.   Answer: 132
<result>C</result>
There are 10 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?