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Arithmetic Sequencesmedium
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An arithmetic sequence has first term a1=5a_1 = 5a1​=5 and common difference d=−2d = -2d=−2. Find the 12th term a12a_{12}a12​ using the formula an=a1+(n−1)da_n = a_1 + (n-1)dan​=a1​+(n−1)d.