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Suppose that a and b are digits in base d > 6 such that . Find a_d - b_d in base d. thanks! smiley

 Apr 7, 2018
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63_7  +  66_7  = 162_7

 

6_7    -   3_7   = 3_7

 

Note: The first base I tried was base 7. I converted 162_7 to base 10 = 93. Then I tried 2 numbers that add up to 93. I tried 45 + 48 = 93. Then I converted 45 to base 7 =63. And similarly, converted 48 to base 7 = 66. Then added 63 + 66 (base 7) =162_7. That is how I arrived at the answer above.

 Apr 7, 2018
edited by Guest  Apr 7, 2018

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