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  1.  Two dice are thrown simultaneously. What is the probability of getting the sum of the face number is at least 10?

  2. A.

    1/3

    B.

    1/6

    C.

    2/3

    D.

    5/6

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    Answer : Option B

    Explanation :

    In a simultaneous throw of two dice, we have n(s) = 6 x 6 = 36
    Let E = event of getting two number whose sum is at least 10.
    Then E = { (4,6), (5,5), (5,6), (6,4), (6,5), (6,6) }
    therefore, n(E) = 6
    And P(E) = p( getting two numbers whose sum is at least 10)
    P(E) = n(E)/n(s) = 6/36 = 1/6
    Hence the answer is 1/6 


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