American footballs and Rugby balls are both considered 'balls' but neither are spheres.
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A rugby ball.
a number wich disproves a proposition For example, theprime number 2 is a counterexample to the statement "All prime numbers are odd."
a number wich disproves a proposition For example, theprime number 2 is a counterexample to the statement "All prime numbers are odd."
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So that they roll smoothly. Notice that the balls for American football are not spheres, they bounce unpredictably when they hit theground.