How many different passwords are there

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Reference no: EM132175753

A valid password is a string of between 6 and 12 characters, inclusive, where each character can be an uppercase or a lowercase letter (i.e., a, ..., z, A, ..., Z), a dollar sign ($), an underscore (_), or a digit (0, ..., 9), except that the first character must be a digit.

For example, 0aaaaa is a valid password; but Aaaaaa is not. How many different passwords are there? (Express your answer as a sum.)

Reference no: EM132175753

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