A perfect square number lies between 1700 and 1800 and is divisible by 9. Find that number and its square root.
Show answer & explanation
Correct answer: C
Explanation
Given:
Numbers between 1700 and 1800, perfect squares, and divisible by 9.
Formula:
Perfect square = n²
41² = 1681
42² = 1764
43² = 1849
1764 is in the middle.
Sum of digits = 1 + 7 + 6 + 4 = 18 ⇒ divisible by 9.
1764, 42