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00:00  Probability problem  marbles are drawn (both red) 
00:32  Understanding the problem 
00:55  Scenario 1  pick one marble after the other 
01:54  Scenario 2  pick  replace  pick 
03:06  Probability using permutations & combinations 
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1. What is the probability of drawing a red marble from the given set of marbles? 
2. Are the marbles drawn with replacement or without replacement in this scenario? 
3. How can the probability of drawing a blue marble be calculated? 
4. What are the possible outcomes when drawing marbles from the given set? 
5. Is there any information provided about the total number of marbles in the set? 
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