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U5 = 5 (dikurangi)
b.5 = 10
b = 10/5 = 2
nilai a :
U5 = 5
a+4b = 5
a+8 = 5
a = 5-8 = -3
Sn = 1/2n (2a+(n-1)b)
S20 = 20/2 (2.-3+(19)2)
S20 = 10 (-6 + 38)
S20 = 10 (32)
S20 = 320