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a = 1
b = 2
S40 = 40/2 (2 x 1 +(40-1)2)
S40 = 20 (2 + (39 x 2)
S40 = 20 (2 + 78)
S40 = 20 (80)
S40 = 1600
atau rumus mudahnya = n² = 40² = 1600
S40=40/2(2.1 +(40-1)2)
S40= 20 (2+78)
S40=20.80
S40=1600