Page 49 - NUMINO Challenge_C2
P. 49
Type 5-2 Number of People with the Same Birthdays
Mary is making a study group such that there will always be three
students who have their birthdays on the same day of the week. How
many students are there in Mary’s study group?
1 If there must be at least two students who have their birthdays on the
same day, how many students must Mary pick? Think about the unluckiest
case, and complete the chart.
Monday Tuesday Wednesday Thursday Friday Saturday Sunday
2 At least how many students are needed such that there are always two
students with the same birthday?
3 If there must be at least three students who have the same birthday, how
many students must there be? Think about the unluckiest case, and
complete the chart.
Monday Tuesday Wednesday Thursday Friday Saturday Sunday
4 How many students are needed such that there are at least three students
who have their birthdays on the same day?
46 NUMINO Challenge C2
Mary is making a study group such that there will always be three
students who have their birthdays on the same day of the week. How
many students are there in Mary’s study group?
1 If there must be at least two students who have their birthdays on the
same day, how many students must Mary pick? Think about the unluckiest
case, and complete the chart.
Monday Tuesday Wednesday Thursday Friday Saturday Sunday
2 At least how many students are needed such that there are always two
students with the same birthday?
3 If there must be at least three students who have the same birthday, how
many students must there be? Think about the unluckiest case, and
complete the chart.
Monday Tuesday Wednesday Thursday Friday Saturday Sunday
4 How many students are needed such that there are at least three students
who have their birthdays on the same day?
46 NUMINO Challenge C2
