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23. The first term of a geometric sequence is a, and the common ratio, r, is positive. 10a (i) Given that the sum of

23. The first term of a geometric sequence is a, and the common ratio, r, is positive. 10a (i) Given that the sum of the second and third terms is, calculate the value of r. (ii) Given also that the sum of the first 4 terms is 65, calculate the value of a and hence calculate the sum to infinity of the series.

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