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sam
sam asked in Science & MathematicsMathematics · 2 weeks ago

Probability question ?

9 boys and 12 girls on a trip. There’s 6 students that will be selected to go. What is the probability that only girls will be on the trip. Round to the nearest thousandth. 

1 Answer

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  • rotchm
    Lv 7
    2 weeks ago

    There are thus 21 students to choose from.

    There is a prob of 12/21 for the first chosen be a Girl. 

    Then, there is a prob of 11/20 for the next chosen be a Girl.

    Then, there is a prob of...

    See the pattern? Six times. 

    The sought prob is the multiplication of these six probs.

    Final answer = ?

    Done!

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