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A, B, C, and D are positive digits such that ABCD + BCD + CD + D =2021. Find A + B + C + D

 Jul 18, 2022
 #1
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+1

  ABCD

+  BCD

+    CD

+       D

______

----  4D

 

Note that this is impossible

 

4D   must  be   an even  number for any positive digit D     so    it  cannot  end with a   "1"

 

 

cool cool cool

 Jul 18, 2022

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