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  • And our only answer choice less than 81 is <math>\boxed{(A) 80}</math> (RegularHexagon)
    10 KB (1,414 words) - 11:59, 27 October 2023
  • ...g from the total gives <math>6561-3280=\boxed{\textbf{(D) } 3281}</math>. (RegularHexagon, KLBBC minor changes)
    10 KB (1,531 words) - 17:00, 18 October 2023
  • ...st <math>n</math> satisfying both is <math>lcm(5, 39)=\boxed{195}</math>. (RegularHexagon)
    10 KB (1,448 words) - 06:30, 21 April 2024