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completely lost.. The thing that screws me most is the fact that it doesn't start from time=0 , but 30 minutes after t=0. =/ Any help is greatly appreciated.

need help with this question... i think i might have the solution, although not quite sure, what i've done is: 1st digit - 2! ways 2nd digit - 10! ways ... .. .. 8th digit - 10! ways therefore 2! + 7(10!) is that right?

Need help with question 2 and 3, i can't seem to finish it. Heres what i've done so far for question 2: i can only get one case to prove true, the other 2 seem dodgy... and question 3: am i going in the right direction?

i'm more concerned about 3 b) though. I can't seem to prove for n=k+1 (I hate factorials) and this thing is due tomorrow. So need an answer in the next 3 hours. Any help is appreciated. Thanks!

lol, i've basically screwed up my final school assessment mark pretty badly. English Advanced ============ Raw Mark: ~80 Rank: 15/50 2 unit Maths ========= Raw Mark: ~60 Rank: 27/40 3unit Maths ======== Raw Mark: ~45 Rank: 18/29 IPT == Raw Mark: 90 Rank 1/14 Chemistry...