Question 1196578
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The probability that no one girl is chosen equals  {{{C[4]^2/C[4+5]^2)}}} = {{{C[4]^2/C[9]^2}}} = {{{6/36}}} = {{{1/6}}}

    (because under this assumption, we chose 2 boys from 4 boys among 9 people).



THEREFORE, the probability that at least 1 girl is chosen 

equals to the COMPLEMENTARY probability  1 - {{{1/6}}} = {{{5/6}}}.    <U>ANSWER</U>
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Solved.