• 2021 December(E23) Math Question 19

    Probability

    - More than One Event

    Independent Events
    Choice C

    We have two children of Grade 3 and 4 and we have to find the probability of these two.

    Probability  of  grade  3  child={1}{20}Probability\; of\; grade\; 3\; child=\frac\{1\}\{20\}

    and

    Probability  of  grade  4  child={1}{15}Probability\; of\; grade\; 4\; child=\frac\{1\}\{15\}
    ∴Probability  of  both  children={1}{15}×{1}{20}={1}{300}\therefore Probability\; of\; both\; children=\frac\{1\}\{15\}\times\frac\{1\}\{20\}=\frac\{1\}\{300\}

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