Question

there are 23 stations between Delhi and Chennai .how many first class tickets have to be printed.so that a passenger can travel from any station to any other station​

Answer 1

Answer:

30 *29=870

1.From Delhi, 29 possibilities.

2.From station 1, after Delhi 1 possibility to Delhi and 28 towards chennai — total 29

3.From station 2, after Delhi 2 possibilities to Delhi and 27 towards Chennai--total 29.

*

*

30. From Chennai, 29 possibilities towards Delhi

Total 30*29=870