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by mak on April 21st, 2008

mak

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A level maths; Edexcel; S1. Question: P(A) = 0.6, P(B) = 0.3 and P(A U B) = 0.8, find P(A n B). Why does this make sense? I thought P(A U B) was calculated as P(A) + P(B) - P(AnB), but clearly this doesn't work. Answer states P(A n B) = 0.1

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Answers. 2 helpful answers below.

  • by Quirkie on April 21st, 2008

    Quirkie

    Taking your formula:
    P(A U B) = P(A)+ P(B) - P(A n B)
    substitute:
    0.8 = 0.6 + 0.3 - P(A n B)

    So P(A n B) = 0.1

    So where did you go wrong?

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    4 comments | Post one | Permalink

  • by JakobA I^_^I the alooney on July 31st, 2010

    JakobA I^_^I the alooney

    "but clearly this doesn't work."

    Yes it does. What makes you think it does not.

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You're reading A level maths; Edexcel; S1. Question: P(A) = 0.6, P(B) = 0.3 and P(A U B) = 0.8, find P(A n B). Why does this make sense? I thought P(A U B) was calculated as P(A) + P(B) - P(AnB), but clearly this doesn't work. Answer states P(A n B) = 0.1

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