Which of the following years is not a leap year?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 2100
An ordinary year is a leap year when it is divisible by 4. A century year (one ending in 00) is a leap year only when it is divisible by 400.
Option (1) 2028 — \(2028=4\times507\), a leap year
Option (2) 1988 — \(1988=4\times497\), a leap year
Option (3) 2400 — a century year; \(2400=6\times400\), a leap year
Option (4) 2100 — a century year; \(2100\div400=5.25\), not a whole number, so 2100 is not a leap year