What rule can be used to find the next term of the arithmetic sequence? 39, 60, 81, 102, 123, . . . an = anâ€"1 â€" 39 an = anâ€"1 â€" 21 an = anâ€"1 + 21 an = anâ€"1 + 39 The next term of the arithmetic sequence 39, 60, 81, 102, 123, . . . is .

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