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Question 1043357:  12 (base 9) + 13 (base 9) + 122 (base 9) 
11 (base 7) - 2 (base 7) 
537 (base 9) - 216 (base 9) 
 Answer by stanbon(75887)      (Show Source): 
You can  put this solution on YOUR website! 12 (base 9) + 13 (base 9) + 122 (base 9) 
2+3+2 = 7 
1 + 1 + 2 = 4 
0 + 0 + 1 = 1 
Ans:: 147(base 9) 
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11 (base 7) - 2 (base 7) 
Note:: 11(base)7 = 8(base 10) 
So, 11(7) - 2(7) = 6(7) 
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537 (base 9) - 216 (base 9) 
7-6 = 1 
3-1 = 2 
5-2 = 3 
Ans: 321(base 9) 
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Cheers, 
Stan H. 
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