Which of the following is not a leap year?

### Concept & Century Leap Year Rule For a standard year to be a leap year, it must be divisible by 4. However, for a century year (a year ending in 00) to be a leap year, it MUST be perfectly divisible by 400. ### Step-by-Step Solution - The options given are all century years (700, 800, 1200, 2000). - We must test each one by dividing it by 400. - Option (b) $800 \div 400 = 2$ (Leap year) - Option (c) $1200 \div 400 = 3$ (Leap year) - Option (d) $2000 \div 400 = 5$ (Leap year) - Option (a) $700 \div 400 = 1.75$ (Not perfectly divisible) - Since 700 is not completely divisible by 400, it is an ordinary year with 365 days, not a leap year. ### Exam Strategy & Shortcut Ignore the zeroes and just look at the leading digits. If the leading digit(s) cannot be divided by 4 without a remainder, it is not a leap year. 7 is not divisible by 4. ### Common Pitfall Mistakenly dividing a century year by 4 instead of 400. 700 is divisible by 4, which tricks many students into thinking it is a leap year. ### Final Answer Therefore, the correct answer is **700**.