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a = 100
b = 4
Un = a + (n-1)b
200 = 100 + (n-1)4
200 = 100 + 4n - 4
200 = 96 + 4n
200 - 96 = 4n
104 = 4n
104 : 4 = n
26 = n
maka ada 26 buah angka
jika ditanyakan jumlah
Sn = n/2 (a + Un)
S26 = 26/2 (100 + 200)
S26 = 13 (300)
S26 = 3.900