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rumus suku ke-n =un × 2
u5 = 24 × 2 = 48
u6 = 48 × 2 = 96
u7 = 96 × 2 = 192
a.suku ke 7 = 192
b. jumlah 7 suku pertama = 3+6+12+24+48+96+192 =