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• Casework
  ...r is four-digit. The possible cases in this category are <math>AAAA, AAAB, AABA, ABAA, BAAA, AABB, ABAB,</math> and <math>ABBA.</math> Using the same logic
  5 KB (709 words) - 17:40, 24 September 2024
• 2004 AIME II Problems/Problem 4
  ...rs (or we can list them: <math>AB, BA, AAB, ABA, BAA, ABB, BAB, BBA, AAAB, AABA, ABAA,</math> <math>BAAA, AABB, ABAB, BAAB, ABBA, BABA, BBAA, ABBB, BABB, B
  3 KB (508 words) - 01:16, 19 January 2024
• 2007 iTest Problems/Problem 12
  ...s 1 way (AAA), a four game series occurs <math>{3\choose 1}=3</math> ways (AABA,ABAA,BAAA), and a
  3 KB (500 words) - 04:44, 10 June 2018