Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

10_CuspofPower_10

Teesha is in the French club. There are 31 students in the club. The French teacher will pick two students at random to guide visiting students from France. What is the probability that Teesha will be picked as a guide? Hint: Teesha must be picked first or second A. 1/30 B. 30/31 C. 1/930 D. 2/31

  • one year ago
  • one year ago

  • This Question is Closed
  1. hartnn
    Best Response
    You've already chosen the best response.
    Medals 5

    just solved the same type of question.... http://openstudy.com/users/smokeysthename#/updates/51518fd7e4b0ae0b658be4da

    • one year ago
  2. 10_CuspofPower_10
    Best Response
    You've already chosen the best response.
    Medals 0

    Thank you hartnn, I'll take a look at that.

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

    welcome ^_^ if you got any doubts, ask here, we'll clarify it here itself.

    • one year ago
  4. 10_CuspofPower_10
    Best Response
    You've already chosen the best response.
    Medals 0

    Thank you, will do. :b

    • one year ago
  5. 10_CuspofPower_10
    Best Response
    You've already chosen the best response.
    Medals 0

    Mhmm Mhmm so I went and looked............ I'm extremely lost o.o lol >.<

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

    the probability that Teesha will be picked as a guide means Teesha will be picked on 1st selection AND Teesha will be picked on 2nd selection got this ?

    • one year ago
  7. 10_CuspofPower_10
    Best Response
    You've already chosen the best response.
    Medals 0

    Yesh

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

    i would like to revise my previous statement, the probability that Teesha will be picked as a guide means Teesha will be picked on 1st selection and NOT in 2nd(because she's already selected), AND Teesha will be picked on 2nd selection and NOT in 1st.

    • one year ago
  9. 10_CuspofPower_10
    Best Response
    You've already chosen the best response.
    Medals 0

    Oooooh, so what happens then?

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

    so, we'll consider 1st case, Teesha will be picked on 1st selection and NOT in 2nd(because she's already selected), 1st selection, teacher has 31 choices, to select teesha, she has 1 option, so, 1/31 2nd selection, teacher now have 30 other choices, and to NOT select teesha, she can pick any of 30 other, so 30/30 so, overall for 1st case, it'll be 1/31 *30/30 got this ?

    • one year ago
  11. 10_CuspofPower_10
    Best Response
    You've already chosen the best response.
    Medals 0

    I got it...... 30/930, does it need to be simplified?

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

    1/31 + 30/31*1/30 = 2/31 how you got 30/930 ??

    • one year ago
  13. 10_CuspofPower_10
    Best Response
    You've already chosen the best response.
    Medals 0

    Lol............ ooooooh goodness, I multiplied 1/31 *30/30 o.o

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

    ohh..for 1st case....30/30 =1 :P i though you've got the final answer.

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

    ok, did you understand 1st case ? can i move to 2nd case ?

    • one year ago
  16. 10_CuspofPower_10
    Best Response
    You've already chosen the best response.
    Medals 0

    Yes please, moving on :b

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

    2nd case, Teesha will be picked on 2nd selection and NOT in 1st., 1st selection, teacher has 31 choices, to NOT select teesha, she has 30 other options, so, 30/31 2nd selection, teacher now have 30 other choices, and to select teesha, she have to pick her, so 1/30 so, overall for 1st case, it'll be 30/31*1/30 = 1/31 got this ?

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

    since the 2 cases are independent, you'll add them, 1/31 + 1/31 = 2/31

    • one year ago
  19. 10_CuspofPower_10
    Best Response
    You've already chosen the best response.
    Medals 0

    Ok then

    • one year ago
  20. 10_CuspofPower_10
    Best Response
    You've already chosen the best response.
    Medals 0

    So 2/31 * 1/31 would = 2/31 as the answer? Lol, or am I too early?

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

    1/31 + 1/31 = 2/31 thats why 2/31 is the answer as we considered both the cases.

    • one year ago
  22. 10_CuspofPower_10
    Best Response
    You've already chosen the best response.
    Medals 0

    Ohhhhhhh lol ok, I understand that now :b

    • one year ago
  23. 10_CuspofPower_10
    Best Response
    You've already chosen the best response.
    Medals 0

    Thank you [: You've been fanned lol.

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

    thanks for fanning! :D and welcome ^_^

    • one year ago
    • Attachments:

See more questions >>>

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.