C1 - Sequences and series q18
The fourth term of an arithmetic series is 3k where k i s a contrast and the sum of the first six terms of the series is 7k + 9.
a) Show that the first term of the series is 9-8k.
b) Find an expression for the common difference of the series in terms of k. Given that the seventh term of the series is 12 calculate.
c)The value of k
d)The sum of the first 20 terms of the series.
a) Show that the first term of the series is 9-8k.
b) Find an expression for the common difference of the series in terms of k. Given that the seventh term of the series is 12 calculate.
c)The value of k
d)The sum of the first 20 terms of the series.
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