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Sn = 2n^2 - 3n
S20 = 2(20^2) - 3(20) = 800-60 = 740
S30 = 2(30^2) - 3(30) = 1.800 - 90 = 1.710

S20 + S30 = 740 + 1.710 = 2.450
jawaban C

S20=2(20)^2-3(20)
S20=800-60
S20=740

S30=2(30)^2-3(30)
S30=1800-90
S30=1710

S= S20+S30
S=740+1710
S=2450 (c)