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7. An arithmetic series has first term a and common difference d. The sum of the first ten terms of the series is 460. a)

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7. An arithmetic series has first term a and common difference d. The sum of the first ten terms of the series is 460. a) Show that 2a + 9d = 92. b) Given also that the 25th term of the sequence is 241, find the value of d. c) The nth term of the series is u . Given that uk 1000, find the value of k un n=1

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