During the test it is very difficult to think clearly if you are so stress, so my main recommendation is to calm down, and read very well the problem.

For this question in particular it was necessary to understand very well, what I was reading. First understanding what kind of  data do I have it and then, what the questions were asking for. Then in order to figure it out which was the pattern or sequence that follows the carpet, it was necessary to put attention to how was the main trend of the graph. Then by applying the studied concepts, it was more easy to find out the answer. Specially if you think in which is easiest kind of series to work with, while doing sum.

Following the questions in the given order was also very helpful, because, by going from a specific pattern to a more general one was the key point in solving the rest of the questions.  For the second question, Just applying previous knowledge was OK. An finally for the third question the most important thing was to visualizate how the trend or sequence works  and think about ,what if it goes to the infinity?.

DNA 🙂