A-LevelMathematicsProbability and statisticsOct/Nov 2021Paper 5 Q58 Marks
A security code consists of 2 letters followed by a 4-digit number. The letters are chosen from {A, B, C, D, E} and the digits are chosen from {1, 2, 3, 4, 5, 6, 7}. No letter or digit may appear more than once. An example of a code is BE3216.
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