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2x0 to 2x20

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
        Help!  

Question
Answer
2x0   0  
🗑
2x1   2  
🗑
2x2   4  
🗑
2x3   6  
🗑
2x4   8  
🗑
2x5   10  
🗑
2x6   12  
🗑
2x7   14  
🗑
2x8   16  
🗑
2x9   18  
🗑
2x10   20  
🗑
2x11   22  
🗑
2x12   24  
🗑
2x13   26  
🗑
2x14   28  
🗑
2x15   30  
🗑
2x16   32  
🗑
2x17   34  
🗑
2x18   36  
🗑
2x19   38  
🗑
2x20   40  
🗑
3x20   60  
🗑
3x19   57  
🗑
3x18   54  
🗑


   

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