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*** Possible spoiler alert! ***

I've been trying to reason out the vocab test given by Oswald & Cornelius outside the courthouse. I figured out the logic of questions #1 and #3, but I'm not able to figure out #2 other than by brute force.

Here are my notes for Q2:

given:
seven robots
each is factor or sturn
each has quad, linear, multi
# factor > # sturn
all linear are factor
no sturn have quad

derived:
4-6 factor
1-3 sturn
factor can have any proc
all sturn are multi
quad: 0-3
linear: 0-6
multi: 0-7

Q2: if exactly 2 factor have same proc, which is true:
1. 1 of 7 robots has quad
2. 2 of 7 have linear
3. 3 of 7 are sturn
4. 4 of 7 have multi
5. 5 of 7 are factor

I'm missing how 2 factorbuilt robots having the same processor limits the problem space sufficiently to derive an answer, especially when there is no limit on processor types for factorbuilt robots (linear implies factorbuilt, but not vice versa).


*** SPOILER ALERT! ***

I know that the answer is option #3, but can anyone explain the logic behind this? Thanks!
This question / problem has been solved by gogaccount111image
You must have at least four Factorbuilt robots, as you note. But if "exactly two" Factorbuilt robots have the same processor, then you can also have at most four Factorbuilt robots. Of the three types, Factorbuilts have to be:

QQLM
QLLM
or
QLMM

To get to more than four Factorbuilts combination would lead to at either least three Factorbuilts of the same type (e.g., QQQLM) or at least two sets of Factorbuilts with two of the same type (e.g., QQLLM).

Since you can only four Factorbuilts, there must be three Sturnweilerbuilts.
Post edited April 19, 2013 by gogaccount111
Ah, thanks!

I think I wasn't focusing enough on "exactly" in the phrase "exactly two". I had also decided against writing out permutations like your examples, but in retrospect that probably would have helped too.
Hey sorry to barge in, but I still don't understand why there can't be 6 Factor built robots.

With a combination of 1,2,3 of each type and only one Sturnweiler built robot.

All the statements are still true in this scenario.
Five Factorbuilts would have the same processor type in that scenario (two should share Type A and three should share Type B).
Post edited December 19, 2014 by WormwoodStudios