Question: In the C++ programming language, a variable must start with a letter or the underscore character (_) and succeeding characters must be letters, digits, or

In the C++ programming language, a variable must start with a letter or the underscore character (_) and succeeding characters must be letters, digits, or the underscore character. Uppercase and lowercase letters are considered to be different.

a. How many variable names having exactly four characters can be formed in C++?

b. How many variable names having at most four characters can be formed in C++?

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