CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2005

  • question_answer
    If three natural numbers from 1 to 100 are selected randomly, then probability that all are divisible by both 2 and 3, is:

    A)  \[\frac{4}{105}\]                                             

    B)  \[\frac{4}{33}\]

    C)  \[\frac{4}{35}\]               

    D)         \[\frac{4}{1155}\]

    E)  \[\frac{3}{1155}\]

    Correct Answer: D

    Solution :

    Let E= Events of numbers divisible by 2 and 3                    (i.e., divisible by 6) \[=(6,12,...,96)\] \[n(E)=16\] \[\therefore \]Required probability\[=\frac{^{16}{{C}_{3}}}{{{100}_{{{C}_{3}}}}}\]                                                 \[=\frac{\frac{16\times 15\times 14}{3\times 2\times 1}}{\frac{100\times 99\times 98}{3\times 2\times 1}}\]                                                 \[=\frac{4}{1155}\]


You need to login to perform this action.
You will be redirected in 3 sec spinner