A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

mathmath333

  • one year ago

There are 7 different books in a library. A girl can borrow book B if only book A is borrowed. In how many ways can she borrow 3 books ?

  • This Question is Closed
  1. mathmath333
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    \(\large \color{black}{\begin{align} & \normalsize \text{There are 7 different books in a library. }\hspace{.33em}\\~\\ & \normalsize \text{A girl can borrow book B if only book A is borrowed.} \hspace{.33em}\\~\\ & \normalsize \text{In how many ways can she borrow 3 books ?} \hspace{.33em}\\~\\ & a.)\ 15 \hspace{.33em}\\~\\ & b.)\ 20 \hspace{.33em}\\~\\ & c.)\ 25 \hspace{.33em}\\~\\ & d.)\ 30 \hspace{.33em}\\~\\ \end{align}}\)

  2. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    is there any specific arrange for A and B ?

  3. mathmate
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    ``` A girl can borrow book B if only book A is borrowed ``` Must book A be borrowed by the girl or by someone else?

  4. phi
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    25

  5. mathmath333
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    book B can be borrowed only if book A is borrowed

  6. mathmath333
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yes 25 is answer given , how u got it

  7. zzr0ck3r
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    I am confused by the question. But phi is not :)

  8. mathmath333
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    "A girl can borrow book B if only book A is borrowed" i think "Must book A be borrowed by the girl "

  9. mathmath333
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    lol m also confused by thhe question

  10. mathmate
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    "A girl can borrow book B if only she also borrows book A" is the intended wording if 25 is the final answer.

  11. phi
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 3

    First, order does not matter. I broke the problem into two parts. say one of the 3 books we choose is A. then we have a choice of 6C2 for the other two. that is 15 combinations say we did not choose A. then that means we can not choose B either. that leaves 5 books from which to choose 3 5C3= 10 more combinations 15+10= 25

  12. mathmath333
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    "A girl can borrow book B if only she also borrows book A" is the intended wording if 25 is the final answer. yea i think so ,

  13. mathmath333
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    thnx

  14. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.