Counter Example
Definition of Counter Example
Counterexample is an example that is used to disprove a statement.
Example of Counter Example

The opposite of a number is always positive.
Counterexample for the above statement: The opposite of 2 is  2, a negative number.
Video Examples: Geometry  Inductive Reasoning & Counterexamples
Solved Example on Counter Example
Ques: Which of the following is a counterexample of the statement, "The perimeter of a rectangle can never be an odd number"?
Choices:
A. Length of a rectangle is 3.25 in. and width is 5.25 in.B. Length of a rectangle is 10 in. and width is 7 in.
C. Length of a rectangle is 6.5 in. and width is 4.5 in.
D. Length of a rectangle is 9 in. and width is 5 in.
Correct Answer: A
Solution:

Step 1: The counterexample that disproves the given statement is:
'Length of a rectangle is 3.25 in. and width is 5.25 in.'
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