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

210

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Solution

The correct option is A $210$
Number of tickets selected from first station $= 20$
from second $= 19$
.... for last station $= 0$
so total number of possible tickets $= 20 + 19 + 18 + . . . + 1 + 0 = 210$

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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

The correct option is A 210Number of tickets selected from first station =20from second =19.... for last station =0so total number of possible tickets =20+19+18+...+1+0=210

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

The correct option is A $210$
Number of tickets selected from first station $= 20$
from second $= 19$
.... for last station $= 0$
so total number of possible tickets $= 20 + 19 + 18 + . . . + 1 + 0 = 210$