The name of a variable in the JAVA programming language is a string of 1 to 65,535 characters, where each character can be an uppercase or a lowercase letter, a dollar sign, an underscore, or a digit. Furthermore, the first character in the string must not be a digit. How many different variable names are there in JAVA? Hint: recall that the sum of the first n terms of a geometric series is given by ark-1-aro +ar1 +ar2 +.. +ar- 1a(1 - 7) 1-r k-1