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Math Help - Probability

  1. #1
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    Probability

    A teacher has to show various stationary items to her students so as to make them learn the names of the items. She has 6 pens, 4 pencils, 3 erasers, 2 sharpeners, and 5 rulers in a bag.
    If she randomly picks an item from the bag, then what is the probability that the students get to learn about an item used for writing?
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  2. #2
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    P = chance of getting something for writing/total

    Pens and pencils are used for writing
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  3. #3
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    Quote Originally Posted by e^(i*pi) View Post
    P = chance of getting something for writing/total

    Pens and pencils are used for writing
    The options are 9/11, 10/17, 5/17, 10/19. I can not calculate the answer, could you please help more? Thank you very much for your reply.
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    Quote Originally Posted by sureshrju View Post
    The options are 9/11, 10/17, 5/17, 10/19. I can not calculate the answer, could you please help more? Thank you very much for your reply.
    None of those options are correct. The answer is (6+4)/(6 + 4 + 3 + 2 + 5) = ....
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