Find the sum of the arithmetic series by using a formula. 2+5+8+11+14+17+20 (Type the terms of your expression in the same order as they appear in the original expression." a₁ + an O A. Sn=n 2 1-1 (+) 1-r OD. an = a₁(r)n-¹= + B. a = a₁ + (n-1)d = + (-¹)= (0-¹0-0 OC. Sn = a1 2 ***

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