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Which of the following is not a leap year?

  • A.700
  • B.800
  • C.1200
  • D.2000

Answer: A

A year is a leap year if it is divisible by 4, except that a century year must also be divisible by 400.

  • \( 800 \div 400 = 2 \) ✓
  • \( 1200 \div 400 = 3 \) ✓
  • \( 2000 \div 400 = 5 \) ✓
  • \( 700 \div 400 = 1.75 \) ✗

So 700 is not a leap year, even though it is divisible by 4. The 400-year rule exists because the tropical year is a little under \( 365.25 \) days.

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