pigeon hole question (2 Viewers)

[yashbb]

A die is thrown repeatedly.
What is the smallest number of times the die must be thrown to ensure at least one number
turns up twice?

 

[Life'sHard]

7 times? Assuming it's a six sided die.

 

[yashbb]

7 times? Assuming it's a six sided die.

why 7 though?

 

[Life'sHard]

Cause there's 6 numbers you could roll and once you roll the next one you'll definitely roll a double assuming you've rolled one of each number previously.

 

[yashbb]

Cause there's 6 numbers you could roll and once you roll the next one you'll definitely roll a double assuming you've rolled one of each number previously.

aahhhhh thank you thank you!!!!!

 

[notme123]

Here's a similar question you can try:

Given that n students are to be placed into 4 classrooms, what is the minimum number of students to guarantee that there are at least two students born in the same month in each of the 4 classrooms?