CBSE Class 12-commerce Answered
In a book shelf there are 4 BM books, 3 commerce book and 5 economic book. two books are picked randomly one after the other without replacement. What is the probabality that both books are of same type.
Asked by rrajeshthapa1998 | 17 Mar, 2019, 02:34: PM
Expert Answer
probability of selecting both BM book one after another= (4/12)×(3/11)
probability of selecting both commerce book one after another = (3/12)×(2/11)
probability of selecting both economic book one after another = (5/12)×(4/11)
probability of selecting books of same subject one after another = (12+6+20)/132 = 19/66
Answered by Thiyagarajan K | 17 Mar, 2019, 02:50: PM
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