Faced with this question during job interview and wondering what is the solution.


  • $\begingroup$ the answer is a. :) $\endgroup$
    – Oray
    Feb 17, 2023 at 16:32
  • $\begingroup$ Thanks! Could you please elaborate more on why a? :) $\endgroup$
    – John
    Feb 17, 2023 at 16:35
  • 4
    $\begingroup$ Is solving this puzzle part of your interview? Did you ask after the interview was finished, or did you ask us midway? What "rights" does the puzzle create reserve, per the footer? Do they allow you to post the question elsewhere? $\endgroup$
    – bobble
    Feb 17, 2023 at 17:12

2 Answers 2


for blues, you will take

sum of blues with their right locations, two blues + one blue becomes three blues with right locations.

for other colors,

you will take the different resulting as green. for first one two green one red results 1 green, for the other one three green two red becomes one green and so on.


My guess is

First piece


Blue squares in the last row are added
Red squares in the central row delete the greens ones


I'm not sure about the green squares in the center row

  • $\begingroup$ Thank you! Looks like this is the solution. $\endgroup$
    – John
    Feb 17, 2023 at 16:50

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