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200 = 100 + 5n - 5
200 = 95 + 5n
105 = 5n
21 = n
Sn = n/2 (2a + (n - 1)b)
S21 = 21/2 (2(100) + (21 - 1)5)
S21 = 11.5 (200 + 100)
S21 = 11.5 (300)
S21 = 3.450