Boy Mow Chau's answer to Ken's Junior College 1 H1 Maths Singapore question.
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For part (iii), may i know if the answer of 72/105 is from your teacher? Considering that 72/105 is more than 1/2, the probability seems too high, so is quite doubtful to be correct.
I am interpreting the question as saying that the group of 3 students consisting of chairperson, vice-chairperson & secretary, are standing in the center of the row, occupying the 3rd, 4th & 5th positions (in various order).
Another possible interpretation may be that either one of the 3 (chairperson, vice-chairperson or secretary) is standing at the exact center (4th position), but I feel that this is an incorrect interpretation.
I am interpreting the question as saying that the group of 3 students consisting of chairperson, vice-chairperson & secretary, are standing in the center of the row, occupying the 3rd, 4th & 5th positions (in various order).
Another possible interpretation may be that either one of the 3 (chairperson, vice-chairperson or secretary) is standing at the exact center (4th position), but I feel that this is an incorrect interpretation.
Date Posted:
1 year ago
Thank you
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