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u5 = 108
108 = u3 +2b
108 = 66 + 2b
2b = 108-66
2b = 42
b = 42/2
b = 21
Ditanya :
a. U1 = 66-21-21 = 24
b. Sn = n/2 (2a + (n-1) b
S12= 12/2 (2×24 + (12-1)×21
= 6 (48 +(11×21)
= 6 (48 + 231)
= 6 × 11008
= 66528