Subcategories

• Week 1

  Ordered Arrangements, Venn Diagram, Overlapping Worlds, Careful Casework

  Day 1 Day 2 Day 3 Day 4
  38
  Topics
  124
  Posts

  S

  I believe the choice A is also correct. Because these involve operations among sets, not numbers. So it doesn't matter if you subtract a certain part twice.

• Week 2

  Day 5 Day 6 Day 7 Day 8
  29
  Topics
  78
  Posts

  B

  In the video, when Prof. Loh was explaining the second way to do the pirates and gold coins problem, he only took away 8 choose 3. I thought you should take away all the different cases like 7 choose 3, 6 choose 3, etc. Why didn't he take away the rest? Thanks.

• Week 3

  Day 9 Day 10 Day 11 Day 12
  41
  Topics
  138
  Posts

  F

  Actually, never mind. I just realized that Prof. Loh just explained it in the next part.

• Week 4

  Counting Orderings, Matchings, Pouring Buckets, Polyhedra

  Day 13 Day 14 Day 15 Day 16
  20
  Topics
  55
  Posts

  F

  Screen Shot 2023-03-14 at 8.32.19 AM.png

  Hi! I don't understand why it's 6 gold pirates and not 7 if there are 7 numbers on the number line...? It's not like the separators a, b, and c will be placed between the numbers, or will they? But I do understand why it's 4 pirates. Thanks!