Q58 / 155 · WBJEE 2020 · Mathematics

In a 12 storied building, 3 persons enter a lift cabin. It is known that they will leave the lift at different floors. In how many ways can they do so if the lift does not stop at the second floor?

  • A
    36
  • B
    120
  • C
    240
  • Correct answer
    D
    720

Solution

Hint: Total no. of ways $=10_{p_{3}}=720$ (except the floor they enter and second floor)

Hence, the correct answer is option: 'D'.

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