An urn contains 5 red and 2 green balls. A ball is drawn at random from the urn. If the drawn ball is green, then a red ball is added to the urn and if the drawn ball is red, then a green ball is added to the urn; the original ball is not returned to the urn. Now, a second ball is drawn at random from it. The probability that the second ball is red, is:
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: Event of drawing a Red ball and placing a green ball in the bag
: Event of drawing a green ball and placing a red ball in the bag
: Event of drawing a red ball in second draw 
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