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If an=3/4-(3/4)^2+(3/4)^3+...(-1)^(n-1)(...

If `a_n=3/4-(3/4)^2+(3/4)^3+...(-1)^(n-1)(3/4)^n` and `b_n=1-a_n`, then find the minimum natural number n, such that `b_n>a_n`

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