Skip to content
Related Articles

Related Articles

Improve Article

GATE | GATE-CS-2007 | Question 24

  • Difficulty Level : Medium
  • Last Updated : 23 Oct, 2017

Suppose we uniformly and randomly select a permutation from the 20! Permutations of 1, 2, 3 ,…..,20. What is the probability that 2 appears at an earlier position than any other even number in the selected permutation?
(A) 1/2
(B) 1/10
(C) 9!/20!
(D) Node of the above


Answer: (B)

Explanation: All even numbers have the same probability of being first (The odd numbers do not matter here). And there are 10 of them. The probability 2 comes before the other 9 evens is = 1/10.
So, option (B) is correct.

Quiz of this Question

Attention reader! Don’t stop learning now.  Practice GATE exam well before the actual exam with the subject-wise and overall quizzes available in GATE Test Series Course.

Learn all GATE CS concepts with Free Live Classes on our youtube channel.

My Personal Notes arrow_drop_up
Recommended Articles
Page :