Discussion

Which of the following year is a leap year?

Answer: D

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

All four are century years, so each must be divisible by 400.

\[ 2500 \div 400 = 6.25 \ \times, \quad 1700 \div 400 = 4.25 \ \times, \quad 1900 \div 400 = 4.75 \ \times \]

\[ 2400 \div 400 = 6 \ \checkmark \]

So 2400 is the leap year.

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