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Solve (AB)^2 = ACD, where AB is a two-digit number, ACD is a three-digit number, and A, B, C, D are all different digits.

 Aug 16, 2020
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Both 13 or 14 will work:

 

13^2 = 169 - All 4 digits different:1, 3, 6, 9

 

14^2 = 196 - All 4 digits different: 1, 4, 9, 6

 Aug 16, 2020

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