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U1 atau a = 5.1 - 3 = 5 - 3 = 2
U2 = 5.2 - 3 = 10 - 3 = 7
U3 = 5.3 - 3 = 15 -3 = 12
U4 = 5.4 - 3 = 20 - 3 = 17
U5 = 5.5 - 3 = 25 - 3 = 22
U6 = 5.6 - 3 = 30 - 3 = 27
Sn = n/2 (a + Un)
S6 = 6/2 (a + U6)
S6 = 3 (2 + 27)
S6 = 3 (29) >> 87