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jacky27

  • one year ago

Andrea's change purse contained 8 quarters, 9 dimes, and 8 nickels.If andrea chose 2 coins randomly without replacing them in her purse,what is the probability that she chose 2 dimes?

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  1. FutureMathProfessor
    • one year ago
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    flutter you

  2. jacky27
    • one year ago
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    uhm, excuse me. but can i get an explanation on this problem,please really stuck on this.

  3. swissgirl
    • one year ago
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    ok so we have 25 coins altogether

  4. swissgirl
    • one year ago
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    and we have 9 dimes

  5. jacky27
    • one year ago
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    okay im following

  6. swissgirl
    • one year ago
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    So the first time we choose a coin the probability that it will be a dime is 9/25 correct?

  7. jacky27
    • one year ago
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    Yeah?

  8. swissgirl
    • one year ago
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    ya there are 25 coins altogether and 9 dimes so the probability that it will be a dime is dimes/total amt of coins = 9/25

  9. swissgirl
    • one year ago
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    The second time we choose a coin

  10. jacky27
    • one year ago
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    okay i get you

  11. swissgirl
    • one year ago
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    there are only 24 coins left cuz we picked a dime

  12. jacky27
    • one year ago
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    okay

  13. swissgirl
    • one year ago
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    so there are 24 coins and 8 dimes so the probabiity we will choose a dime is 8/24

  14. swissgirl
    • one year ago
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    So altogether the probability that we will choose 2 dimes is 9/25*8/24

  15. jacky27
    • one year ago
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    so the answer would be 3/25, right?

  16. swissgirl
    • one year ago
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    yup :)

  17. jacky27
    • one year ago
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    Omg! Thank You So Much!(:

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