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10_CuspofPower_10

  • one year ago

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

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  1. hartnn
    • one year ago
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    just solved the same type of question.... http://openstudy.com/users/smokeysthename#/updates/51518fd7e4b0ae0b658be4da

  2. 10_CuspofPower_10
    • one year ago
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    Thank you hartnn, I'll take a look at that.

  3. hartnn
    • one year ago
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    welcome ^_^ if you got any doubts, ask here, we'll clarify it here itself.

  4. 10_CuspofPower_10
    • one year ago
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    Thank you, will do. :b

  5. 10_CuspofPower_10
    • one year ago
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    Mhmm Mhmm so I went and looked............ I'm extremely lost o.o lol >.<

  6. hartnn
    • one year ago
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    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 ?

  7. 10_CuspofPower_10
    • one year ago
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    Yesh

  8. hartnn
    • one year ago
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    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.

  9. 10_CuspofPower_10
    • one year ago
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    Oooooh, so what happens then?

  10. hartnn
    • one year ago
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    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 ?

  11. 10_CuspofPower_10
    • one year ago
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    I got it...... 30/930, does it need to be simplified?

  12. hartnn
    • one year ago
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    1/31 + 30/31*1/30 = 2/31 how you got 30/930 ??

  13. 10_CuspofPower_10
    • one year ago
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    Lol............ ooooooh goodness, I multiplied 1/31 *30/30 o.o

  14. hartnn
    • one year ago
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    ohh..for 1st case....30/30 =1 :P i though you've got the final answer.

  15. hartnn
    • one year ago
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    ok, did you understand 1st case ? can i move to 2nd case ?

  16. 10_CuspofPower_10
    • one year ago
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    Yes please, moving on :b

  17. hartnn
    • one year ago
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    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 ?

  18. hartnn
    • one year ago
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    since the 2 cases are independent, you'll add them, 1/31 + 1/31 = 2/31

  19. 10_CuspofPower_10
    • one year ago
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    Ok then

  20. 10_CuspofPower_10
    • one year ago
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    So 2/31 * 1/31 would = 2/31 as the answer? Lol, or am I too early?

  21. hartnn
    • one year ago
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    1/31 + 1/31 = 2/31 thats why 2/31 is the answer as we considered both the cases.

  22. 10_CuspofPower_10
    • one year ago
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    Ohhhhhhh lol ok, I understand that now :b

  23. 10_CuspofPower_10
    • one year ago
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    Thank you [: You've been fanned lol.

  24. hartnn
    • one year ago
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    thanks for fanning! :D and welcome ^_^

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