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  • Perplex
    IB Math AAHL
    /
    Probability
    /

    Problem Bank

    [Maximum mark: 6]
    1. Show that ​P(X∩Y)+P(X∩Y′)=P(X)​ for any events ​X​ and ​Y.

      [2]

    Julia randomly selects a marble from a bag of numbered and colored marbles. The probability that the marble

    • displays an even number is ​0.6,

    • is red is ​0.3,

    • displays an odd number or is red is ​0.4.

    1. Using the identity in (a), find the probability that the marble displays an odd number and is not red.

      [4]

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