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Q: Find the least number which when added to 1780 makes the sum a perfect square.
  • A. 46
  • B. 49
  • C. 69
  • D. 72
Correct Answer: Option C - On adding 69 to the number 1780 it will be 1849, which is a perfect square number. Thus- 1780 + 69 = 1849 1849 = 43 × 43 (43)² = 1849
C. On adding 69 to the number 1780 it will be 1849, which is a perfect square number. Thus- 1780 + 69 = 1849 1849 = 43 × 43 (43)² = 1849

Explanations:

On adding 69 to the number 1780 it will be 1849, which is a perfect square number. Thus- 1780 + 69 = 1849 1849 = 43 × 43 (43)² = 1849