Ask Question
24 March, 22:23

A bookshelf contains 9 mysteries, 7 biographies, and 4 science fiction books. A book is randomly selected, not replaced, then another is selected. Find the probability of selecting a biography then a mystery.

+3
Answers (2)
  1. 25 March, 00:24
    0
    63/380

    Step-by-step explanation:

    Initially,

    # of Mysteries, M = 9

    # of Biographies, B = 7

    # of Sci. Fiction, S = 4

    Total number of books = 9 + 7 + 4 = 20 books

    P (first book selected is biography) = 7/20

    After selecting 1 biography book,

    # of Mysteries, M = 9

    # of Biographies, B = 7 - 1 = 6

    # of Sci. Fiction, S = 4

    Total number of books remaining = 9 + 6 + 4 = 19 books

    P (second book selected is a mystery) = 9/19

    Hence (P first book is biography and 2nd book is mystery)

    = (7/20) (9/19)

    = 63/380
  2. 25 March, 01:53
    0
    63/380
Know the Answer?
Not Sure About the Answer?
Find an answer to your question ✅ “A bookshelf contains 9 mysteries, 7 biographies, and 4 science fiction books. A book is randomly selected, not replaced, then another is ...” in 📘 Mathematics if you're in doubt about the correctness of the answers or there's no answer, then try to use the smart search and find answers to the similar questions.
Search for Other Answers