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Which year has 366 days?

  • A.1900
  • B.1200
  • C.2500
  • D.1700

Answer: B

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

  • 1900 ÷ 400 is not whole ✗
  • 1700 ÷ 400 is not whole ✗
  • 2500 ÷ 400 is not whole ✗
  • \( 1200 \div 400 = 3 \) ✓

So 1200 has 366 days. All four are divisible by 4, which is exactly why the century rule is needed to separate them.

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