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A bewildering physics problem solved using 128 tennis balls

Here's an interesting physics problem for you. Imagine that you have 128 tennis balls, and can arrange them any way you want. How many arrangements are possible? You might ask why this is important, and does anyone care?

Disposing of 14 million old tennis balls? France has a solution

Tennis players in France get through a staggering 14 million tennis balls each year. The French Tennis Federation has come up with a novel solution to recycle old tennis balls generating a benefit to communities.

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How many ways can use arrange 128 tennis balls?
How many ways can use arrange 128 tennis balls?
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