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10_CuspofPower_10

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

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

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

  4. 10_CuspofPower_10
    • 2 years ago
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    Thank you, will do. :b

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

  6. hartnn
    • 2 years 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
    • 2 years ago
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    Yesh

  8. hartnn
    • 2 years 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
    • 2 years ago
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    Oooooh, so what happens then?

  10. hartnn
    • 2 years 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
    • 2 years ago
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    I got it...... 30/930, does it need to be simplified?

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

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

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

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

  16. 10_CuspofPower_10
    • 2 years ago
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    Yes please, moving on :b

  17. hartnn
    • 2 years 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
    • 2 years 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
    • 2 years ago
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    Ok then

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

  21. hartnn
    • 2 years 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
    • 2 years ago
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    Ohhhhhhh lol ok, I understand that now :b

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

  24. hartnn
    • 2 years ago
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    thanks for fanning! :D and welcome ^_^

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