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  • On a railway there are 20 stations. The number of different tickets required in order that it may be possible to travel from every station to every station is<

On a railway there are 20 stations. The number of different tickets required in order that it may be possible to travel from every station to every station is

Option: 1

210
 


Option: 2

225


Option: 3

196

 


Option: 4

105


Answers (1)

best_answer

The number of different tickets

\begin{aligned} & =20+19+18+17+\ldots+3+2+1 \\ & =210 \end{aligned}
 

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