1. First ball was red
No. of red balls: 2
Total number of balls:5
2. First ball was white
No. of white balls: 3
Total number of balls: 5
3. Second ball was red:
The probability is given by
Now we'll calculate P(R,R)
After the first red, there is one more red left, and four balls altogether, therefore
Probability of the second ball being red is
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