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```        On a railway there are 20 stations. The no of different tickets required in order that it may be possible to travel from every station to every station.

we have to add 20 +19+18+...+3+2+1 to get the answer ..Is there any SHORTCUT TO SOLVE IT IN LESS TIME ??```
5 years ago

SHAIK AASIF AHAMED
74 Points
```										Hello student,please find the answer to your question belowGiven that on a railway there are 20 stations and asked to find out the no of different tickets required in order that it may be possible to travel from every station to every station.The solution can be obtained by simply adding the ways=20+19+.....+1for which we have a formula=n(n+1)/2=21(20)/2=210.This is the simplest way.
```
3 years ago
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