There are 25 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 correct choice from the following options
A) 156	B) 167	C) 157	D) 352	E) 702
The total number of stations = 27   From 27 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 = 27 * 26= 
<gadget id="calculator">27 * 26</gadget>
<output>702</output>
702.   Answer: 702
<result>E</result>
There are 25 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?