allery48 = 2x2x2x2x3 has one unpaired 3. The smallest number to multiply 48 by to get a perfect square is:
A3
B2
C4
D6
Answer & Solution
Correct answer: A. 3
1. Every prime must appear in pairs.
2. Only the 3 lacks a partner.
3. Multiply by 3 to get 144.
_Source: syllabus Mathematics, Chapter 6, Squares and Square Roots._
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