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U3 = 7 (dikurang)
b.4 = 8
b = 8/4 = 2
Nilai a :
U3 = a+2b
7 = a+4
a = 7-4
a = 3
U30 = a+29b
U30 = 3+29(2)
U30 = 61
Sn = 1/2n (a+Un)
S30 = 1/2.30 (3+U30)
S30 = 15(3+61)
S30 = 15(64)
S30 = 960
Jadi, jumlah 30 suku pertama adalah 960