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Thanks guys :) I hate perm and com they're so hard sometimes

Eight people attend a meeting. They are provided with two circular tables, one seating 3 people, the other 5 people. (i) How many seating arrangements are possible? (ii) If the seating is done randomly, what is the probability that a particular couple are on different tables? I don't...

\lim_{x\rightarrow 0}\frac{1- cos 2x}{x^{2}} How would u work this one out? Thanks in advance !

CSSA HSC trials 2003 Question 3. a) iii)

Thanks guys will do :)

how would u solve it graphically in an exam? cause this question came from CSSA.

How would you solve this equation? x-e^{-x}=0

I'm not quite sure how to do this :S http://www.boardofstudies.nsw.edu.au/testResults.cfm?testID=12722943&testUUID=BBA5B8FB-E9BA-0ED2-7AFF8493FE0EEBAA&question_id=8019&question_num=1&correctAnswer=A&user_answer=C&courseID=15050&testQuestionID=256810828 Please help Thanks =)