Which of the following statements is incorrect?a)The square of any pos...
The square of any positive integer is always positive, so Option A is correct.
A parallelogram with four right angles is indeed a rectangle, making Option B correct.
The sum of any two even numbers is always even, so Option C is correct.
The cube of an even number is not always odd; it is always even, making Option D incorrect.
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Which of the following statements is incorrect?a)The square of any pos...
Understanding the Incorrect Statement
The statement in question is:
“The cube of an even number is always odd.”
This statement is incorrect. Let's break down why.
Definition of Even Numbers
- Even numbers are integers that can be divided by 2 without a remainder.
- Examples include: 0, 2, 4, 6, 8, etc.
Calculating the Cube of an Even Number
- When you cube an even number (multiply it by itself three times), the result is also even.
- Example:
- If we take 2 (an even number), its cube is 2 x 2 x 2 = 8, which is even.
- If we take 4, its cube is 4 x 4 x 4 = 64, which is also even.
General Rule for Even Numbers
- The cube of any even number can be represented as (2n)³, where n is an integer.
- This simplifies to 8n³, which is still even since it can be divided by 2.
Conclusion
- Thus, the cube of an even number is never odd; it is always even.
- Therefore, option D is indeed the incorrect statement among the choices provided.
This distinction between even and odd numbers is fundamental in mathematics, and understanding it helps clarify many concepts in number theory.