A card stack contains white and black cards. Two cards are drawn randomly without replacement. The probability of selecting a white and then a black card is x. The probability of selecting a white card in the first draw is y. You have to find the probability of drawing a black card, given that the first card drawn was white.
The input will contain two lines with x and y respectively.
The output should be displayed as a float(no need to round it off).
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Step-by-step explanation:
Black card=x
White card=not known.
So, if Black card is x, then white card would be=y. So, now (x+y)
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