Q: Is there a limited range of numbers that would be reasonable values for the variable?

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variable expression, I believe.

A variable which can take only a finite number of values. These may be whole numbers or, like hat or shoe sizes, they can take values that are in halves.

The pattern depends on the values of a and b. These could depend what base they are in or on their variable values.

No, because numbers never vary. A variable expression must have something in it that can take on different values, usually a letter, like 'x' for example.

A continuous variable is one that can take any real numerical value. The length of a strip can be anything. A person's height and age can take any real values, within reasonable limits. Whereas, discrete variables will only have values that are whole numbers, like the number of people on a football team, or the number of major planets in the solar system. No star could ever have 5.62 major planets, for example.

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variable expression, I believe.

variable

A variable which can take only a finite number of values. These may be whole numbers or, like hat or shoe sizes, they can take values that are in halves.

Symbols used to represent unspecified numbers or values.

The pattern depends on the values of a and b. These could depend what base they are in or on their variable values.

No, because numbers never vary. A variable expression must have something in it that can take on different values, usually a letter, like 'x' for example.

A discrete random variable is a variable that can only take some selected values. The values that it can take may be infinite in number (eg the counting numbers), but unlike a continuous random variable, it cannot take any value in between valid results.

A continuous variable is one that can take any real numerical value. The length of a strip can be anything. A person's height and age can take any real values, within reasonable limits. Whereas, discrete variables will only have values that are whole numbers, like the number of people on a football team, or the number of major planets in the solar system. No star could ever have 5.62 major planets, for example.

You must substitute values for the variable.

variable which is used to specify the values and also we can that values through the variable name

If a variable has possible values -2 6 and 17 then this variable is an Integer.

natural numbers!!