Suppose we uniformly and randomly select a permutation from the 20! Permutations of 1 2 GATE CS 2007

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PS29 CS08
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? GATE CS 2007
(a) 1/2 (b) 1/10 (c) 9!/20! (d) Node of the above

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Minakshi Porwal (9460189461)
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Hello sir. I hope you remember me, I was a part of your team at TECHNO. I am a faculty at THE GATE ACADEMY now and teach Engg maths and subjects of ME there. I found your explanation of this question tremendously good. Good to see you here!!

pallavigupta
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why didnt we select 10 places for even numbers like we did for odd numbers

grishmaprasad
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In made wasy booklet ans - d is given pls clarify about it

arpitbisen