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Another probability Q!

  • 26-01-2012 10:42pm
    #1
    help_me1
    Registered Users Posts: 16 ✭


    A student has to select a subject from (german, chemistry, french, physics, history) and a subject from (maths, irish, spainish, biology)

    Q. If a student must select a language, how many choices does the student have? I worked out the number of selections of not choosing a language and hence the prob of choosing one is 14.

    This is the second part were I got stuck. The student can select a third subject from the group (art, home ec, accounting, technology) and the student must chose a language. How many choices does the student no have. The answer at the back is 74???


Comments

  • #2
    MathsManiac
    Registered Users, Registered Users 2 Posts: 1,595 ✭✭✭MathsManiac


    I assume that for first part you meant to say that the number of possible choices is 14, not the probability.

    Unless I'm misinterpreting the second part, the answer is 14*4 = 56.

    Of course, if "can select" in the second bit implies that they don't have to, then it's 56+14=70.


  • #3
    Wesc.
    Registered Users, Registered Users 2 Posts: 715 ✭✭✭Wesc.


    Absolutely hate probability! :mad: I just van't get my head round it.


  • #4
    help_me1
    Registered Users Posts: 16 ✭help_me1


    Sorry yes I meant select. I got 56 but I thought I was doing it wrong as the answer at the back of the book is 74


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