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Which of the fallowing is not a leap year?

  • A.2000
  • B.2008
  • C.2009
  • D.2012

Answer: C

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

\[ 2000 \div 400 = 5 \ \checkmark, \qquad 2008 \div 4 = 502 \ \checkmark, \qquad 2012 \div 4 = 503 \ \checkmark \]

\[ 2009 \div 4 = 502.25 \ \times \]

So 2009 is not a leap year.

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