Tag: number-theory

Interview Questions

• The 100 lockers problem
• The chicken nugget problem
• Two mentalists and the digit that was crossed out
• How many squares does a diagonal cross?
• The divisible-by-9 magic trick
• The last digit of a giant power of 3
• The sum and product puzzle
• Add up the first 100 odd numbers
• Three children, product of ages is 72
• How many zeros end 100 factorial?
• Fewest perfect squares that sum to n
• Group fractions that are equal
• Detect a happy number with constant memory
• A number divisible by 2, 3, or 5