Trivia

Subject:
Friday Puzzler -- bags of marbles

Alex Y
Bag A has 50 white and 50 black marbles.
Bag B has 100 white marbles.
Bag C starts out empty.
Without looking, you move one marble each from bag A and bag B into bag C.
You then remove one marble from Bag C and see that it is white.
What is the probability that the marble remaining in bag C is also white?

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