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b. s10=10/2.(2.2+(10-1).2)
=5.(4+(9.2))
=5.22
= 110
r = 4/2 = 2
Un = 1024
Un = ar^(n - 1)
1024 = 2(2)^(n - 1)
512 = 2^(n - 1)
2^9 = 2^(n - 1)
9 = n - 1
n = 10
a) banyak suku = 10
b) S10 = 2(2^10 - 1)/(2 - 1)
= 1023