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b = 5-2 = 3
S20 = 20/2 (2a+(n-1)b)
S20 = 10 (2x2 + (20-1)3)
S20 = 10 (4 + ( 19 x 3)
S20 = 10 (4 + 57)
S20 = 10 (61)
S20 = 610