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Using 42 = 40 + 2, the square of 42 is:

A1764
B1684
C1604
D1744
Answer & Solution
Correct answer: A. 1764
1. 40 squared is 1600. 2. Add 80 + 80 + 4. 3. That gives 1764. _Source: syllabus Mathematics, Chapter 6, Squares and Square Roots._
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