This is the answer key and explanation for the past papers of the B schedule. I believe the accuracy is high as it is based on the answers I received during lab visits, as well as those of other examinees. Contents ⭐︎Problems and answers from H18 to 2021 ⭐︎Memorization notes for mathematical logic and automata ⭐︎Memorization notes for proof diagrams Features ⭐︎I have summarized the key points to remember after each answer. →Like a high school textbook, I have highlighted in blue the areas where students tend to get stuck on problems, so you can handle similar problems even if they appear on the exam. ⭐︎I have provided detailed answers. →I have achieved a 100% answer rate for mathematics, which is the most difficult subject to prepare for. I have also written out the intermediate steps carefully, making it easier to study even if you are not good at math. Of course, I have provided answers and explanations for all subjects except for a few questions. ⭐︎I will give a 500 yen discount to those who have already purchased from other sellers. →I understand that you may be hesitant to purchase answers from multiple people from the same university. Therefore, if you have already purchased past papers from the Tokyo Tech Department of Information Science from another seller, I will give you a 500 yen discount at the time of purchase. Of course, the discount will also apply if you purchase them at the same time as past papers from other sellers. If you would like a discount, please let me know in the comments section. *Notes* ⚪︎Some parts do not have answers. ⚪︎There are no answers for topics outside the scope of the exam (signal processing, Schema, complex analysis, etc.). ⚪︎Regarding the accuracy of the answers, they are based on the answers from the Tokyo Tech laboratory. ⚪︎Years when exams were not held due to the coronavirus, etc., are not included. ⚪︎Secondary sales and resales are prohibited. We will report them to the management and file a small claims lawsuit if we find any. ⚪︎We do not offer individual sales.