Question 1176176
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Hi
U1 = 1W & 5R   and  U2 has 5W & 1R
Ball withdrawn:

P( U2| W) = P(U2 and W)/P(W) ={{{ (1/2)(5/6)/((1/2)(1/6) + (1/2)(5/6))= (1/2)(5/6)/(1/2) = 5/6}}}
 
Wish You the Best in your Studies.
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