junior trader interview questions shared by candidates
I have two cards that can only be red or black. I tell you that at least one of two is red. What's the probability that I hold two reds?
One bag contains 13 white and 15 black marbles. Outside we have 28 black marbles. Every time I pick two marbles from the bag and place back one, whose color depends on the combination of the marbles I put out. Combos : OUT: 1 black-1 white IN : 1 white OUT: 2 blacks IN : 1 black OUT: 2 whites IN : 1 black What is always the color of the last marble remaining?
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