If every even term of a series is a time...

If every even term of a series is a times the term before it and every odd term is c times the before it, the first term being unity, then the sum to 2n terms is

`((1-c^(n))(1 - a^(n))/(1-ac)`

`((1+a)(1 - c^(n)a^(n)))/(1-ac)`

`((1 + c^(n))(1 + a^(n)))/(1 - ac)`

`((1 + a)(1 + c^(n)a^(n)))/(1 + ac)`

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