9th Class Mathematics Probability Question Bank Probability

  • question_answer
    Two dice are thrown simultaneously. What is the probability of getting two numbers whose product is even?

    A) \[\frac{1}{2}\]                           

    B) \[\frac{3}{4}\] 

    C) \[\frac{3}{8}\]                                      

    D) \[\frac{5}{16}\]

    E) None of these

    Correct Answer: B

    Solution :

    Explanation Option [b] is correct. In a simultaneous throw of two dice, we have \[\operatorname{n} \left( S \right)=\,\,\left( 6\times 6 \right) 36\] Let E = event of getting two numbers whose product Is even. Then, E = {(1,2), (1,4,) (1,6), (2,1), (2,2), (2,3), (2,4), (2,5), (2,6), (3,2), (3,4), (3,6), (4,1), (4,2), (4,3), (4,4), (4,5), (4,6), (5/2), (5,4), (5.6), (6,1), (6,2), (6,3), (6,4), (6,5), (6,6)}. \[\therefore \,\,\,P(E)\,=27\] \[\therefore \,\,\,P(E)\,=\frac{n(E)}{n(S)}=\frac{17}{3+6}=\frac{3}{4}\]


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