Can you solve the locker riddle? - Lisa Winer

In the locker puzzle, what determines if a locker will remain open at the end?

• It is touched an even number of times.

• It is touched an odd number of times.

• It is touched by only one person.

• It is touched by all 100 people.

Which type of number has an odd number of factors?

• Prime numbers

• Even numbers

• Perfect squares

• Odd numbers

Out of 100 lockers, how many will remain open at the end of the process?

• 5

• 10

• 25

• 50

What kind of numbers are touched exactly twice in the locker puzzle?

• Composite numbers

• Prime numbers

• Square numbers

• Even numbers