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AP EAMCET201726 Apr 2017Morning ShiftMathematicsPermutation and CombinationActual

There are 10 intermediate stations on a railway line between two particular stations. The number of ways that a train can be made to stop at 3 of these intermediate stations so that no two of these halting stations are consecutive is

Options

  1. A56
  2. B20
  3. C126
  4. D120

Correct answer

A. 56

Step-by-step solution

Given that, there are 10 intermediate stations between two particular stations. Here, the train stops at only 3 stations and no two of them should be consecutive. Therefore, there are 8 stations to select these 3 stations. Hence, number of ways = ^8 C₃=56

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