Question

These 2×3×7 are prime factors of some number, find the square of that particular number.

(a) 1764

(b) 1664

(c) 1864

(d) 1964

I have been asked this question in examination.

My question is taken from Square Root in section Squares and Square Roots of Mathematics – Class 8

Answer 1

Right choice is (a) 1764

The explanation: 2 × 3 × 7 = 42. Now we need to find 42^2. When we add first 42 odd numbers we get, 1764. Therefore the correct answer is 1764 and the others are incorrect.