Answer:
The probability of the first marble being blue and second being red is a 50/50 because you have 12 red and 12 blue so 50/50
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Answer:
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sorry I tried but it is hard
 
        
             
        
        
        
Answer:
He did 9 times 10 instead of 9 times 100.
 
        
             
        
        
        
Answer:

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