Each of A, B, C, D, and E has an exam on a different day of a week starting from Monday and ending on Friday of the same week. C has an exam on Thursday. Only one person has an exam between C and B. E does not have an exam either on Wednesday or on Friday. D has an exam on the day immediately after C. How many people have an exam before A?

Seven persons — C, D, E, F, W, X, and Y — have exams on different days of the same week, starting Monday and ending Sunday. F's exam is on Thursday. Only C's exam is scheduled between Y and F. Exactly four persons have exams between D and Y. C's exam is after Y. E's exam is immediately before X's exam. D's exam is after Y. Who among the following has an exam on the first day of the week (Monday)?

Each of D, E, F, G, R, S, and T has an exam on a different day of a week, starting from Monday and ending on Sunday of the same week. Only two people have exams before R. Only one person has an exam after F. Only three people have exams between R and T. Only one person has an exam between G and D. E has an exam immediately before G. Who among the following has an exam on Friday?