anonymous
  • anonymous
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
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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hartnn
  • hartnn
anonymous
  • anonymous
Thank you hartnn, I'll take a look at that.
hartnn
  • hartnn
welcome ^_^ if you got any doubts, ask here, we'll clarify it here itself.

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More answers

anonymous
  • anonymous
Thank you, will do. :b
anonymous
  • anonymous
Mhmm Mhmm so I went and looked............ I'm extremely lost o.o lol >.<
hartnn
  • hartnn
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 ?
anonymous
  • anonymous
Yesh
hartnn
  • hartnn
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.
anonymous
  • anonymous
Oooooh, so what happens then?
hartnn
  • hartnn
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 ?
anonymous
  • anonymous
I got it...... 30/930, does it need to be simplified?
hartnn
  • hartnn
1/31 + 30/31*1/30 = 2/31 how you got 30/930 ??
anonymous
  • anonymous
Lol............ ooooooh goodness, I multiplied 1/31 *30/30 o.o
hartnn
  • hartnn
ohh..for 1st case....30/30 =1 :P i though you've got the final answer.
hartnn
  • hartnn
ok, did you understand 1st case ? can i move to 2nd case ?
anonymous
  • anonymous
Yes please, moving on :b
hartnn
  • hartnn
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 ?
hartnn
  • hartnn
since the 2 cases are independent, you'll add them, 1/31 + 1/31 = 2/31
anonymous
  • anonymous
Ok then
anonymous
  • anonymous
So 2/31 * 1/31 would = 2/31 as the answer? Lol, or am I too early?
hartnn
  • hartnn
1/31 + 1/31 = 2/31 thats why 2/31 is the answer as we considered both the cases.
anonymous
  • anonymous
Ohhhhhhh lol ok, I understand that now :b
anonymous
  • anonymous
Thank you [: You've been fanned lol.
hartnn
  • hartnn
thanks for fanning! :D and welcome ^_^

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