June 1992, Game 3, Number 9 - Casey's Shirts

[netherlands]

Hi there,

I just had a quick question about number 9. It asks what must be true so it threw me off a bit that the correct answer was B. If Casey did not buy a medium yellow shirt, she'd be forced to buy both a medium red and blue shirt either way.

I could only assume that the answer choice was B by assuming that be either they meant either a medium red shirt or a blue red shirt - or both. I guess because "both" were necessary the either/or threw me off but either/or also means possibly both.

Was this the right way to look at this question?

Thank you!

[Dave Killoran]

Hey Netherlands,

Careful with this one because Casey doesn't have to buy both medium shirts, but he does have to buy at least one. So, the wording in (B) is correct as stated.

Here's some options without both remaining medium shirts purchased:

• 1. SY SB MB
  2. SY SB MR
  3. LR LY MB
  4. LR LY MR

And, of course, there are options with both medium shirts bought, and those are okay because "either/or" can mean both.

Please let me know if that makes sense.

Thanks!

[netherlands]

Hi there,

I was just going back to redo this one and realized I'd totally left out to possible templates! Definitely makes more sense now, because two smalls or larges can be purchased in which case it does boil down to an either/or case. So that basically in any scenario either a red or blue must or will be purchased.

Thank you!!