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junior college 1 | H1 Maths
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hazelle
Hazelle

junior college 1 chevron_right H1 Maths chevron_right Singapore

permutation and combination question again! need help :'( thankyouuuu

Date Posted: 3 years ago
Views: 825

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Zhe Xun
Zhe Xun's answer
113 answers (Tutor Details)
1st
Pls check if i made any careless mistakes
hazelle
Hazelle
3 years ago
hello! i just checked the answer key and part b is 310, part c is 301! could be an error in the answer key though;; Also thank you so much!!
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Shu Yi
Shu Yi's answer
18 answers (Tutor Details)
310 for part (b) is correct, here’s the working!
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Shu Yi
Shu Yi's answer
18 answers (Tutor Details)
Solution to (c) :)
In my solution I found the number of ways based on having at least one female, before eliminating all locals cases to satisfy at least one foreign member condition

It is also able to be solved if you find the number of ways first based on having at least one foreign member, before eliminating all males cases!