Correct Answer - Option 4 : 3600
Calculation:
3 = 3 × 1
4 = 2 × 2
5 = 5 × 1
6 = 3 × 2
8 = 2 × 2 × 2
LCM of 3, 4, 5, 6 and 8 = 2 × 2 × 2 × 3 × 5 = 120
2, 3 and 5 are not completed to make perfect square = 120 × 2 × 3 × 5 = 3600
∴ 3600 is least perfect square which is divisible by 3, 4, 5, 6 and 8.
We can divide options containing squares by the LCM of 3, 4, 5, 6 and 8.