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100, 104, 108, ......300
a = 100
b = 4
Un = 300
Un = a + (n - 1)b
Un = 100 + (n - 1)4
Un = 100 + 4n - 4
Un = 96 + 4n
300 = 96 + 4n
4n = 204
n = 51
Sn = n/2(a + Un)
S51 = 51/2(100 + 96 + 4.51)
S51 = 51/2(400)
S51 = 51. 200 = 10.200