Tham KY's answer to Jolene's Junior College 2 H2 Maths question.
Erm, for qns 2 the first code, isn't it 8×7×7×7 since repetitions are allowed?
The '6 choices' refers to the 'not F' location, do only 6 not 7.
It's okay I understand thanks
May I ask how did you get 3! for qns 3
The 3! is because of the three S's, they are identical items, non-distinctable
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