CS 70 Wiki

Welcome to the CS 70 wiki! Here you can collaboratively create content that will help you and other students better learn the material from the course. You will find a page corresponding to each lecture note. The lecture note is broken up into parts and you can add notes, explanations, comments, etc. that you see appropriate in between the parts.

Examples of things you can add to the wiki pages:

• A worked out example that helps people better understand the material.
• Problems you have created or found interesting that you'd like to share.
• Explanations on parts of the course notes that you find useful.
• Mark places where you would like someone to add explanations or examples.
• etc.

You may consult Help or How to Edit Pages to learn how editing this wiki works.

Below is a list of the pages in this wiki.

## Other Pages

Below you can find the latest updates to the Wiki.

## Latest Updated Pages

page 1 of 3123next »

Below you can find the most recent comments across all pages.

 From categories: All categories
Andy (guest) 17 Nov 2013 02:16
in discussion Hidden / Per page discussions » Sets And Mathematical Notation

Hello, I wonder if someone could post the solutions for the hw0

by Andy (guest), 17 Nov 2013 02:16
student (guest) 29 Oct 2013 01:12
in discussion Hidden / Per page discussions » Probability Theory

for Part 19, why is the binary string for that representation 00110110? I understand 00 becaues there are 2 elements in the first bin, and then 11 because there are 2 empty slots, and then 01 because its one element in the third bin, but then the last 2 binary digits 10 are ambiguous because "10" is being interpreted in a different way than "11" was being interpreted earlier..

by student (guest), 29 Oct 2013 01:12
27 Oct 2013 06:40
in discussion Hidden / Per page discussions » CS 70 Wiki

by , 27 Oct 2013 06:40
Andrey (guest) 27 Oct 2013 01:59
in discussion Hidden / Per page discussions » Sample Spaces Events

Nevermind, I think I got it. It might be easier to think of this as 6 bins and 2 balls, as it was suggested in the note later. You can have first ball land in 5 and second in 6, or you can have first ball to land in 6 and second in 5 - and this are two separate cases. However, if first ball lands into 6, and second ball goes into 6 - only one case, assuming that we are throwing 1st ball first and then 2nd all the time.

by Andrey (guest), 27 Oct 2013 01:59
Andrey (guest) 27 Oct 2013 01:45
in discussion Hidden / Per page discussions » Sample Spaces Events

And actually same goes for event B. Why are we assuming that (6, 6) should be counted once?

by Andrey (guest), 27 Oct 2013 01:45
Andrey (guest) 27 Oct 2013 01:43
in discussion Hidden / Per page discussions » Sample Spaces Events

For part 4 in the end, I don't understand why |A| = 6. I counted that there are 8 ways where order matters, A={(4*,6), (5*,6), (6*, 6), (5*, 5), (5, 5*), (6, 6*), (4, 6*), (5, 6*)} (* means that one of the dice is marked or has a scratch). I also recall that professor said it in class that order does matter and (6*, 6) != (6, *6). Please let me know if this makes sense, thank you a lot!

by Andrey (guest), 27 Oct 2013 01:43
Peder (guest) 26 Oct 2013 23:23
in discussion Hidden / Per page discussions » CS 70 Wiki

I just checked my grade for HW2, and I think I was treated unfairly.
How can I request a regrade, and correct the wrong of the grader?

by Peder (guest), 26 Oct 2013 23:23
Andrey (guest) 24 Oct 2013 20:01
in discussion Hidden / Per page discussions » Probability Theory

I also don't understand part 19. How do you reason that the sum of these subsets would add up to (n choose k+1) or n*(n-1 choose k)?

by Andrey (guest), 24 Oct 2013 20:01
Student1 (guest) 23 Oct 2013 10:01
in discussion Hidden / Per page discussions » Probability Theory

Can someone help explain part 20 and why we start picking the lowest numbered element and how that helps us solve this proof? Thank you!

by Student1 (guest), 23 Oct 2013 10:01
26 Sep 2013 18:58
in discussion Hidden / Per page discussions » CS 70 Wiki

Each page has a comments section, which you can either access by clicking the Discuss button, or in pages where it is enabled by just navigating to the bottom of the page. Use the comments sections to discuss what needs to be added to page, requests, etc.

Comments Section by , 26 Sep 2013 18:58
26 Sep 2013 18:37
in discussion Hidden / Per page discussions » CS 70 Wiki

Welcome to the CS 70 wiki!

First comment by , 26 Sep 2013 18:37
page revision: 22, last edited: 12 Nov 2013 10:23