To determine which year is not a leap year, we need to understand the rules of the Gregorian calendar regarding leap years. A year is a leap year if:
This means that:
Let's apply these rules to each option:
Based on the above analysis, the correct answer is that 1900 is not a leap year.
Step 1: Understand the rule for leap years.
A year is a leap year if:
Step 2: Analyze the options.
Final Answer: (1)