Login

Welcome, Guest. Please login or register.

March 29, 2024, 11:41:40 am

Author Topic: Discrete Maths  (Read 18458 times)  Share 

0 Members and 1 Guest are viewing this topic.

FallonXay

  • Trendsetter
  • **
  • Posts: 165
  • Respect: +6
Re: Discrete Maths - Proofs Questions
« Reply #30 on: May 21, 2017, 12:26:33 pm »
0
Counting & combinatorics
Q25 h?
HSC (2016): English Advanced || Mathematics || Mathematics: Extension 1 || Physics || Design and Technology || Japanese Beginners

University: B Science (Computer Science) @UNSW

RuiAce

  • ATAR Notes Lecturer
  • Honorary Moderator
  • Great Wonder of ATAR Notes
  • *******
  • Posts: 8814
  • "All models are wrong, but some are useful."
  • Respect: +2575
Re: Discrete Maths - Proofs Questions
« Reply #31 on: May 21, 2017, 12:54:59 pm »
+1
Counting & combinatorics
Q25 h?


This last part of this bundle was definitely the hardest of them all and my tutor didn't finish it off. I don't fully remember everything either so there's no guarantee that my final answer will be correct.

________________

________________

________________

________________

________________


Also I suggest renaming your thread to just discrete maths if you're gonna put questions from all topics here
« Last Edit: May 21, 2017, 03:12:41 pm by RuiAce »

FallonXay

  • Trendsetter
  • **
  • Posts: 165
  • Respect: +6
Re: Discrete Maths - Proofs Questions
« Reply #32 on: May 21, 2017, 02:08:42 pm »
0


How did you come to this conclusion for the part quoted?

Also, I'm not sure how to rename a thread, sorry :/
HSC (2016): English Advanced || Mathematics || Mathematics: Extension 1 || Physics || Design and Technology || Japanese Beginners

University: B Science (Computer Science) @UNSW

RuiAce

  • ATAR Notes Lecturer
  • Honorary Moderator
  • Great Wonder of ATAR Notes
  • *******
  • Posts: 8814
  • "All models are wrong, but some are useful."
  • Respect: +2575
Re: Discrete Maths - Proofs Questions
« Reply #33 on: May 21, 2017, 02:13:26 pm »
+1
How did you come to this conclusion for the part quoted?

Also, I'm not sure how to rename a thread, sorry :/




Just rename it in the opening post
« Last Edit: May 21, 2017, 02:21:09 pm by RuiAce »

FallonXay

  • Trendsetter
  • **
  • Posts: 165
  • Respect: +6
Re: Discrete Maths
« Reply #34 on: May 21, 2017, 02:56:11 pm »
+1




Just rename it in the opening post

Ohhhhh! That makes a lot of sense!!! Thanks!

(Btw, the total combinations are C(30,5) because there are 25 'dots' and 5 'bars' (addition signs) which equals 30 and you choose 5 places to put the bars. Also for the specific case where one of the y's exceed 9 it should be 3 x C(20,5) because you need a minimum of 10 dots in the y to exceed 9 i.e y2 = z2 + 10 and similarly for the intersection of two y's should be 3 x C(10,5), etc.)

And I changed the thread name, thanks  :)
HSC (2016): English Advanced || Mathematics || Mathematics: Extension 1 || Physics || Design and Technology || Japanese Beginners

University: B Science (Computer Science) @UNSW

RuiAce

  • ATAR Notes Lecturer
  • Honorary Moderator
  • Great Wonder of ATAR Notes
  • *******
  • Posts: 8814
  • "All models are wrong, but some are useful."
  • Respect: +2575
Re: Discrete Maths
« Reply #35 on: May 21, 2017, 03:13:25 pm »
+1
Ohhhhh! That makes a lot of sense!!! Thanks!

(Btw, the total combinations are C(30,5) because there are 25 'dots' and 5 'bars' (addition signs) which equals 30 and you choose 5 places to put the bars. Also for the specific case where one of the y's exceed 9 it should be 3 x C(20,5) because you need a minimum of 10 dots in the y to exceed 9 i.e y2 = z2 + 10 and similarly for the intersection of two y's should be 3 x C(10,5), etc.)

And I changed the thread name, thanks  :)
Yep I agree with those corrections. I'll probably fix them another time though