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Q4.
The 5th term of an arithmetic series is 4k, where k is a constant.
The sum of the first 8 terms of this series is 20k + 16
(a) (i) Find, in terms of k, an expression for the common difference of the series.
(ii) Show that the first term of the series is 16 - 8k
Given that the 9th term of the series is 24, find
(b) the value of k,
(c) the sum of the first 20 terms.
Sagot :
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