Matematika

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\(b_{n-1} \times b_{n+1} = (b_1 q^{n-2}) \times (b_1 q^{n})\)

\(b_n^2 = (b_1 q^{n-1})^2 = b_1^2 q^{n^2-2n+1}\)

\((b_1 q^{n-2}) \times (b_1 q^{n}) = b_1^2 q^{2n-2}\)

\((b_1 q^{n-2}) \times (b_1 q^{n}) = b_1^2 q^{n^2-2n}\)

\(b_{n-1} \times b_{n+1} = b_1 q^{n-2} + b_1 q^{n}\)