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An urn contains 5 red and 2 green balls,...

An urn contains 5 red and 2 green balls, one ball is chosen from urn. If it is red then a green ball is put back into Box, and if it green then a red ball is put in to box (previous ball was not put in that box). Then a second ball is drawn the probebility that it is red ball is (a) `(32)/(49)` (b) `(17)/(49)` (c) `(15)/(49)` (d) `(36)/(49)`

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