cherie chow's answer to Britney Charlene's Secondary 4 A Maths question.
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for (a), recognise that you can choose any 5 letters from total of 9 letters.
For (b), it is more specific since first letter is vowel and last letter is non-vowel/consonant, and the middle 3 letters can be vowel or non-vowel
For (b), it is more specific since first letter is vowel and last letter is non-vowel/consonant, and the middle 3 letters can be vowel or non-vowel
Date Posted:
5 years ago
I think you forgot to permutate for both parts.
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