Discussion
How many leap years does 100 years have?
Answer: B
Multiples of 4 in a century:
\[ \frac{100}{4} = 25 \]
But the century year at the end is a leap year only if divisible by 400, and in three centuries out of four it is not:
\[ 25 - 1 = 24 \]
So an ordinary century has 24 leap years - the standard figure behind the 5 odd days in 100 years.
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