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GATE 2019 EC – Question 4

General Aptitude · Quantitative Aptitude: Probability and Combinatorics · 1 mark · Multiple choice

Five different books (P, Q, R, S, T) are to be arranged on a shelf. The books R and S are to be arranged first and second, respectively from the right side of the shelf. The number of different orders in which P, Q and T may be arranged is ________.

  1. 2
  2. 6
  3. 12
  4. 120

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Show answer and explanation

Correct answer: (B) 6

Explanation

R and S occupy fixed positions, so the remaining three books can be arranged in $3!=6$ ways.