9th Class Mathematics Probability Question Bank Probability

  • question_answer A coloured cube as shown alongside cut into 27 small cubes. What is the probability that a cube selected randomly have at least two faces painted?

    A)  \[\frac{12}{27}\]                      

    B)  \[\frac{8}{27}\]            

    C)  \[\frac{1}{9}\]                        

    D)  \[\frac{20}{27}\]

    Correct Answer: D

    Solution :

    (d): Number of two faces painted cubes = 5 2 No. of thrice faces painted cubes = 8 \[n\left( E \right)=12+8=20\] \[n\left( S \right)=27\] \[n\left( P \right)=\frac{20}{27}\]


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