Subcategories

• Workout 1A (Algebra)

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  G

  For the Your Turn, I noticed that -8 works also (instead of 7.) (-8)^3+(-8)^2=56*-8. 4096 is also a valid answer to the question.

• Workout 1B (Algebra)

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  E

  Is there a typo in the mini question, because answer options 3 and 5 are identical.

• Workout 2A (Geometry)

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  S

  @empathicmonkey I guess the editor made an error and typed the question wrong

• Workout 2B (Geometry)

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  No new posts.
• Workout 3A (Combinatorics)

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  A

  In the explanation, it says the answer is directions x 2-D grids per direction x squares per 2-d grids. What does is mean by 2-d grids per direction?

• Workout 4A (Algebra)

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  I

  First, question 8 of the challenge.

  I feel like I might just be misunderstanding what the question is asking but I think “how many people will know about the rumor on the 7th day” is a bit ambiguous since it can refer to the number of new people who are told on that day, which seems to be what the question is actually asking, or the number of total people who know about it at the end of the day, which is my interpretation of it. So my calculations were that there were 16038 new people told and 8019 people who already knew before, so that 24057 people know about the rumor on the 7th day.

  Second, question 20 is also a bit weird. As it ignores the fact that V can be 0 as it is not present at the start of either TUV or UVT. Using this fact we can find an answer that is even smaller than 148. I think 130 is the actual solution to this question as
  301-130=171 which is a palindrome.

• Workout 5A (Number Theory)

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  S

  @thoughtfulmongoose Let a=2x and b=2y, then the question is asking for the GCD of 2x and 4y. Obviously 2 is a common divisor, but we don't know if x has any more 2s in it. If x has one more factor of 2 and y has none then the greatest common divisor is 4. So the answer should be NEI(not enough info)