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Mathematics 7 Online
OpenStudy (scientistsocrate):

The 1st, 3rd and 9th terms of an A.P are the 1st three terms of a G.P. If the 7th term is 14, calculate: (i) the 20th term of the sequence (ii) the sum of the 1st twelve terms of the G.P (you need not simplify any exponential terms in your answer).

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