• Congratulations to the Class of 2024 on your results!
    Let us know how you went here
    Got a question about your uni preferences? Ask us here

UNSW Sem 2 Finals Thread (1 Viewer)

seanieg89

Well-Known Member
Joined
Aug 8, 2006
Messages
2,662
Gender
Male
HSC
2007
Have you done rank and nullity of a matrix yet?

Another one is probability that would be alright for even a HSC student to do but I suck at probability unless it involves integration of some sort.

Here's the harder probability:

We roll a die successively, until we roll six consecutive sixes, in which case we stop rolling the die.
a) What is the probability we stop rolling it after the 13th throw?
b) What is the probability that we roll the die at least ten times?

Do that in 7 minutes max to be on time with the rest of the question/paper.
a) The last 6 rolls must be 6's. The 7-th roll must be a 1-5 (else we would have an earlier termination) The first 6 rolls can be anything as long as they aren't 6 consecutive 6's.

So

b) Take the complement, probability of termination on 7th,8th,9th rolls are all ((1/6)^6)(5/6) as the first rolls can't hurt us. So

 

4025808

Well-Known Member
Joined
Apr 2, 2009
Messages
4,377
Location
中國農村稻農
Gender
Male
HSC
2011
Uni Grad
2017
GG fucked up petroleum economics. Did okay in reservoir engineering.

Now to memorize a shit tonne of content for geology and petrophysics. Kill me now :(
 

JT145

ON is my homeboy
Joined
Mar 4, 2012
Messages
1,678
Gender
Female
HSC
2016
phone went off in my exam. lol
 

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

Top