_21. What are the first five terms of an arithmetic sequence whose 1t term is 2.6 and a common difference of -1.8? [A] 2.6,-4.68, -9.36,-14.04,-18.72 [B] 2.6,4,68,-9.36, 14.04,-18.72 [C]2.6,0.8,-1,-2.8,-4.6 [D]2.6,4.4,6.2,2.8,9.8

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A: We will solve the problem

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