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U4 = a+ 3b = 45 -
7b = 70 maka b = 10
a + 3b = 45
a + 3(10) =45
a + 30 = 45 maka,a = 15
Sn = 2a + (n-1)b
S200 = 2(15) + (200-1) 10
S 200 = 30 + 1990 = 2020