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Which of the following could not be the lengths of the sides of a right angled triangle?

3, 4, 5
5, 12, 13
8, 15, 17
12, 15, 18

Correct Answer: 12, 15, 18

Explanation:

Using Pythagoras theorem we can see that 12² + 15² is not equal to 18²
Neither is 10² + 24² = 25²

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