$\begin{array}{1 1}(A)\;\large\frac{1}{3}\\(B)\;\large\frac{4}{7}\\(C)\;\large\frac{15}{28}\\(D)\;\large\frac{5}{28}\end{array} $

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\(Frome\; the\; given\; set\; there\; are\; 2\; cases\; in\; which\; there\; are\; 2\; red\; balls\;so\;p(R\;B\;R\;\cup\;R\;R\;B)\)

=\(\Large\frac{3}{7}\;\times\;\frac{4}{6}\;+\;\frac{4}{7}\;\times\;\frac{3}{6}\;=\;\frac{24}{7}\;=\;\frac{4}{7}\)

\('B'\; is\; correct\)

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