Answers I Got Incorrect

Question 15 Robot in Maze

After relooking at this problem, it seems far too easy for me to have gotten wrong. I honestly don’t know what I was thinking, the answer was obvious. I just needed to follow what the code was saying to see if the robot could make it to the gray square, and the only one that wouldnt work based on the given algorithm is D.

This problem was quite confusing to me, as I didn’t really understand what the problem was asking from me. Now that I read it again, I see that it was asking for a condition to be met that will make the function loop infinitely. Reading it again, I see that J =1 and is getting added to 2, meaning that the loop will end when J is an odd number, so my answer of j=7 cannot be correct. Instead the answer must be j=6 because an even number will make the function never be true so it will never end. This question makes sense to me now.

I think I read the problem slightly wrong when answering this question, because now when I reread it, I can see that my answer makes no sense and that the obvious answer is C. The mystery Procedure writes that when the number is greater than 0, it subtracts 2 until the outcome is 0, which is even. If the initial number was odd then the function would never be true because subtracting 2 from an odd number will never equal an even number. Therefore the function will output true when the initial number is even, and false if it is odd. This procedure makes sense to me now, and I just need to pay more attention to what the problem is asking from me and to read each code segment carefully.

This is another example of me not really understanding what the problem is asking from me, and now that I reread the problem again, I can tell the mistake I made. At first all I understood was making a correct program, I assumed that the program was already correct and I realized that flipping 6 and 7 would be essentially the same program, so I decided that that would be the correct answer. Now that I read the problem again, I see that it was asking for a reduced numebr of operations, and after analyzing the choices again, I realize that interchanging lines 7 and 8 would only calculate the average once becayse ut would take the sum/count out of the {}. Once again, I need to pay more attention to and understand what the problem is asking.

I think these collegeboard MCs are really good practice for the real AP test. I am definately much better at all the terminology than I was in tri 1, since this trimester we did a lot of learning of the collegeboard knowledge through the student lessons. After those, I really got the gist of the information that collegeboard wants us to know, so I could definitely answer these questions much better and efficiently than before. I did pretty well: 46/50, and I feel like the only mistake I’ve mainly been making is not understanding what the problem is asking from me. Other than that I feel like the learning we have done in the 2nd trimester has really developed my knowledge of the subject, which translates to better MC scores.