Mathematics (AS & A Level) · Oct / Nov 2021 · Paper 53 · Question 5
9709
As printed in the paper
The question as text
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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5(a)[2]
5(b)[3]
5(c)[3]
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