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Which of the Following Number Are Square of Even Number? 6561

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Question

Which of the following number are square of even number?

6561

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Solution

The numbers whose last digit is odd can never be the square of even numbers. So, we have to leave out  6561 

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Chapter 1: A Squares - Exercise 3.2 [Page 20]

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R.D. Sharma Mathematics Volume 1 and 2 [English] Class 8
Chapter 1 A Squares
Exercise 3.2 | Q 11.6 | Page 20

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Observe the following pattern \[1^2 = \frac{1}{6}\left[ 1 \times \left( 1 + 1 \right) \times \left( 2 \times 1 + 1 \right) \right]\]
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