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A book shelf has 27 books – 9 books each written by 3 eminent authors. If Raj selects any 2 books without looking at their author’s name, what is the probability that he picks up books written by the different authors.

  • a)
    1/3

  • b)
    9/18

  • c)
    9/27

  • d)
    9/13

Correct answer is option 'D'. Can you explain this answer?
Verified Answer
A book shelf has 27 books – 9 books each written by 3 eminent au...
Total possible outcomes  = 27C2


Favourable outcomes = Selecting any two authors × selecting one book for each author=


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A book shelf has 27 books – 9 books each written by 3 eminent au...
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A book shelf has 27 books – 9 books each written by 3 eminent authors. If Raj selects any 2 books without looking at their author’s name, what is the probability that he picks up books written by the different authors.a)1/3b)9/18c)9/27d)9/13Correct answer is option 'D'. Can you explain this answer?
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