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Count sequential choices without replacement. For letters: 2626 choices, then 2525, then 2424. For digits: 1010 then 99. Multiply: 26⋅25⋅24⋅10⋅926\cdot25\cdot24\cdot10\cdot9. Compute: 26⋅25=65026\cdot25=650, 650⋅24=15,600650\cdot24=15{,}600, 15,600⋅90=1,404,00015{,}600\cdot90=1{,}404{,}000. Thus C. CLI reasoning standards prioritize multiplication principle mastery and careful treatment of repetition rules. Common pitfalls include using 263⋅10226^3\cdot10^2 (which allows repeats) or forgetting that letter and digit pools are separate (no overlap constraints). Writing a product with blanks—_×_×_×_×_\_\times\_\times\_\times\_\times\_—and filling counts from left to right makes logic transparent and reduces mistakes. This counting framework extends to permutations/combinations, license plates, seating arrangements, and code generation, core areas where disciplined enumeration is essential.