Question 1123689
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The probability that he will attend Math class    = 1 - 0.24 = 0.76.


The probability that he will attend Biology class = 1 - 0.11 = 0.89.


The probability that he will attend both classes  = 0.69    ( ! given ! )


The probability that he will attend at least one of the two classes =

    0.76 + 0.89 - 0.69 = 0.96.    (*)


The probability that he will skip both classes is the complement to (*)

    1 - 0.96 = 0.04.


<U>Answer</U>.  The probability under the question is  0.04.
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Solved.