Question

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Answer 1

@Directrix

Answer 2

@Tommynaiter

Answer 3

1. The probability of picking a red marble is 5/15 = 1/3: desired/total. If you replace the marble, the probability of picking another red marble is the same, 5/15 = 1/3. The probability of picking red then red is 1/3 * 1/3 = 1/9.

2. The probability of picking the first red marble is 3/10. Since you don't replace the marble, the probability of picking the second red marble is 2/9. The probability of picking red then red is 3/10 * 2/9 = 6/90 = 1/15.