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U6 = a+5b = 17
U10 = a+9b = 33
Gunakan sub/eliminasi:
4b = 16
b = 4, maka a = -3
Jumlah 30 suku pertama:
Rumus Sn=(n/2).(2a+(n-1)b)
S30=(30/2).(2.-3+(29)4)
S30=(15).(-6+116)
S30=15.110
S30=1650