Re: Possibility of two cards will come by the river
There are 50 unknown cards, therefore there are C(50,5) possible boards. There are C(4,2) ways to choose the two jacks and C(46,3) ways to choose the other three cards, so your answer is C(4,2)*C(46,3)/C(50,5)=0.042987408.
Note that this solution is for boards with exactly two jacks, not three or four.
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