Correct Answer - Option 1 : 72900
The pattern is following here,
Option 1 → 72900 → Perfect square of ‘270’
Option 2 → 43700 → Not a Perfect square of any number.
Option 3 → 34700→ Not a Perfect square of any number.
Option 4 → 51600→ Not a Perfect square of any number.
All options follow the same pattern, except ‘Option 1’
Hence, "72900" is the correct answer.