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On a railway track, there are 20 stations. The number of tickets required in order that it may be possible to book a passenger from every station to every other is
  • a)
    C(20,2)
  • b)
    P(20,2)
  • c)
    400
  • d)
    none of these
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
On a railway track, there are 20 stations. The number of tickets requi...
Number of tickets selected from first station =20
from second =19
.... for last station =0
We have to select 2 consecutive stations
so total number of possible tickets = P(20,2)
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On a railway track, there are 20 stations. The number of tickets requi...
Solution:

  • There are 20 stations in total.

  • Number of ways to select 2 stations out of 20 is given by C(20,2).

  • So, the number of tickets required to book a passenger from every station to every other station is P(20,2).

  • Therefore, the correct answer is option B.

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On a railway track, there are 20 stations. The number of tickets required in order that it may be possible to book a passenger from every station to every other isa)C(20,2)b)P(20,2)c)400d)none of theseCorrect answer is option 'B'. Can you explain this answer?
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