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Arithmetic Sequenceshard
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For any arithmetic progression a1,a2,a3,a4,…a_1, a_2, a_3, a_4, \dotsa1​,a2​,a3​,a4​,…, what is the value of the expression a1−3a2+3a3−a4a_1 - 3a_2 + 3a_3 - a_4a1​−3a2​+3a3​−a4​?