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a = 4
b = 4
Un = 196
Un = a + (n - 1)b
Un = 4 + (n-1)4
Un =4 + 4n - 4
Un = 4n
196 = 4n
n = = 49
Sn = (a + Un)
S49 = (4 + 4.49)
=> (200)
=> 49.100 = 4.900