100 closed lockers. Student 1 opens all, student 2 toggles every 2nd, student 3 every 3rd… through student 100. How many end up open?

Answer to unlock results, comments and sharing

No account needed. Voting signs you in as a guest and means you agree to the terms and privacy policy.

Be the first to vote on this guessing question. Is it 0, 10, 25, or 50? Lock in your guess to see the real answer and how many people got it right.