what are constants and variables?

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 constants are arithematical numbers and variables are alphabetical numbers having no fixed value

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 A variable is something that does not have a fixed value, while a constant can stand on its own

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Variable

A variable is something that does not have a fixed value. The value of a variable varies.

In the above example of matchsticks, we have discussed that the number of matchsticks required to form n T’s = 2n, where n is a variable. It does not have a particular value. It can take any value from 1, 2, 3, 4 …