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• Casework
  ...number is three-digit. The possible cases in this category are <math>AAA, AAB, ABA,</math> and <math>BAA.</math> Using a constructive approach, there are
  5 KB (709 words) - 16:40, 24 September 2024
• 2004 AIME II Problems/Problem 4
  ...) + (2^4 - 2) = 22</math> such numbers (or we can list them: <math>AB, BA, AAB, ABA, BAA, ABB, BAB, BBA, AAAB, AABA, ABAA,</math> <math>BAAA, AABB, ABAB,
  3 KB (508 words) - 00:16, 19 January 2024
• 1991 AIME Problems/Problem 10
  aab & 4 & 2 & 3 \\
  5 KB (813 words) - 05:10, 25 February 2024
• 2015 AIME II Problems/Problem 12
  <math>AAB</math> - and the number of valid ways is <math>b_{n-2}</math>.
  12 KB (2,057 words) - 17:54, 10 June 2024