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Grade: 12
        On a railway route there are 15 stations the number of tickets required in order that it may be possible to book a passenger from every station to every other is
2 years ago

Answers : (1)

DR STRANGE
212 Points
							
 
HI,
number tickets possible from station1 =14
for station2 =13 and so on 
hence 14+13+12+....+1= 14(14+1)/2
sum of n natural number n(n+1)/2
plz approve if satisfied :)
2 years ago
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