Pippa has a box containing N pens. There are only black pens and red pens in the the box . The number of black pens in the box is 3 more than the number of red pens. Pippa is going to take at random 2 pens from the box. The probability that she will take a black pen followed by a red pen is 9/35 . Find the possible values of N . Show the clear Algebraic working.
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pippa has abox n pens 9/35
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