This year, Ms. Nelson's class has 20 students. Which of the following statements must be true?
I. This year at least two of these students have their birthdays on a Sunday.
II. This year at least two of these students have their birthdays on the same day of the week
III. At least two of these students have their birthdays in the same month
A) I Only
B) II Only
C)I and III Only
D) II and III Only
E)I, II, and III Only
None of these MUST be true.
It's likely that all of them are true -- but not guaranteed!