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b= 1/2
Un= a+(n-1)b
= 1/2 + (n-1) 1/2
= 1/2 + 1/2n - 1/2
= 1/2
*b adalah beda
1/2^n
1 = 1/ 2^1 = 1/2
2 = 1/2^2 =1/4
3 = 1/2^3 = 1/8 dsb