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A variable is used to hold value. The value may vary in every usage.

An empty box is used to hold things. So, it can have in it the things we put in. The things to be held in the empty box,can change upon every usage. So, an empty box is like a variable.

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โˆ™ 2011-09-08 19:44:30
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A polynomial of degree zero is a constant term

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Q: How is an empty box like a variable?
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