Ask Singapore Homework?
Upload a photo of a Singapore homework and someone will email you the solution for free.
Question
junior college 2 | H2 Maths
One Answer Below
Anyone can contribute an answer, even non-tutors.
Need help
Date Posted: 4 years ago
Views: 408
See 1 Answer
sorry, (a)(ii) & (b)(ii) incorrect.
corrections ...
(a)(ii) at most 1 married couple
also must include cases where other then the 1 couple, the remaining 2 may also include single members of the other couples.
consider case of committee with 2 couples
ways = 3C2 = 3
then for committee with at most 1 couple
ways = 210 - 3 = 207
(easier to calculate as complement, because too many different possible cases, if calculate directly)
(b)(ii) one couple absent and others sit without restrictions
ways = 10P8/10 = 181440
(not necessary to divide by 2!)
corrections ...
(a)(ii) at most 1 married couple
also must include cases where other then the 1 couple, the remaining 2 may also include single members of the other couples.
consider case of committee with 2 couples
ways = 3C2 = 3
then for committee with at most 1 couple
ways = 210 - 3 = 207
(easier to calculate as complement, because too many different possible cases, if calculate directly)
(b)(ii) one couple absent and others sit without restrictions
ways = 10P8/10 = 181440
(not necessary to divide by 2!)
360 Tutoring Program