• Choice A

    $$ Number\ of\ juniors=9 $$

    $$ Number\ of\ seniors=11 $$

    As 1 senior is selected, so the number of seniors available for selection is

    $$ Number\ of\ seniors=11-1=10 $$

    $$ Total\ number\ of \ members \ available=10+9=19 $$

    We have to find the probability of selecting a junior out of the remaining seniors and juniors:

    $$ Probability\ of\ selecting\ a\ junior=\frac{Number\ of\ juniors}{Total\ number\ of \ members \ available}=\frac{9}{19} $$

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