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Two to the power of n, written as 2 n, is the number of values in which the bits in a binary word of length n can be set, where each bit is either of two values. A word, interpreted as representing an integer in a range starting at zero, referred to as an "unsigned integer", can represent values from 0 (000...000 2) to 2 n − 1 (111...111 2) inclusively.
In 2003, according to one estimate, 1.4 million students took the SAT and 1.4 million also took the ACT test, [96] paying about $50 per test. [97] Generally counselors suggest that students should plan on taking the SAT or ACT test twice, so that a low score can possibly be improved. [99]