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Posted by on Monday, May 11, 2009 at 3:00pm.

When I go to the local music store the probability I can buy any particular CD I want is 2/5, but if I go to the department store in nearby Tadchester the probability is 5/6. I want to buy two particular CDs. What is the probability that
(a)I can get them both locally
(b)I fail to get either locally but get both at Tadchester
(c)I fail to get either CD locally or at Tadchester
(d)I get one CD locally and the other at Tadchester?

(a)multiply 2/5?
(b)multiply 5/6?
(c)multiply 3/5 and 1/6?
(d)multiply 2/5 and 5/6?

I think I have this all worng. Thanks for any help!

  • probabilty - , Monday, May 11, 2009 at 4:36pm

    a) both local (2/5)*(2/5)
    b) neither local both a Tads (3/5)*(3/5)*(5/6)*(5/6)
    c) neither local neither a Tads (3/5)*(3/5)*(1/6)*(1/6)
    d) one local, one at Tads 2*[(2/5)*(3/5)*(5/6)]

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