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An urn contains 3 red pens,4 green pens and 6 yellow pens.The number of ways of drawing 4 pens from the urn if atleast one red pen is to be included in the draw is (All the pens are different from each other).

$\begin{array}{1 1}(A)\;500\\(B)\;505\\(C)\;510\\(D)\;\text{None of these}\end{array} $

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