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junior college 1 | H2 Maths
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For Q3(i), answer is 5C2. However, why can't it be 5C1 * 4C1?
Also, what is the rationale to Q3(ii)?
Date Posted: 7 years ago
Views: 1228
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Correct me if I'm wrong
For part i, by doing 5C1 x 4C1 you are double counting the situation as your 5C1 could be Couple A and 4C1 could be Couple B. Another situation could be 5C1 is Couple B and 4C1 be Couple A. Thus you are double counting.
For part i, by doing 5C1 x 4C1 you are double counting the situation as your 5C1 could be Couple A and 4C1 could be Couple B. Another situation could be 5C1 is Couple B and 4C1 be Couple A. Thus you are double counting.
Date Posted:
7 years ago
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