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Core Mathematics C1 Advanced Subsidiary Sequences and …
4. The first term of an arithmetic series is a and the common difference is d. The 18th term of the series is 25 and the 21st term of the series is 32 2 1. (a) Use this information to write down two equations for a and d.(2) (b) Show that a = –17.5 and find the value of d.(2) The sum of the first n terms of the series is 2750. (c) Show that n is given byn2 – 15n = 55 × 40.
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