Class 11MathematicsPermutation and CombinationDefinition of permutation, Number of permutations with or without repetition, Conditional permutations
DifficultThere are $15$ stations on a railway line. How many different types of tickets must be printed so that a passenger can travel from any station to any other station?
- A$225$
- B$210$
- C$14^{15}$
- D$15^{15}$
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