1.

Which of the following is a perfect square?1. 19352. 15203. 7304. 1681

Answer» Correct Answer - Option 4 : 1681

Concept used:

Perfect square should have a pair of each prime factor

Calculation:

1935 = 3 × 3 × 5 × 43

1520 = 2 × 2 × 2 × 2 × 5 × 19

730 = 2 × 5 × 73

1681 = 41 × 41

Here, only 1681 has a pair of each prime factor

∴ The perfect square is 1681



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