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OCR a-level maths
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formula of an arithmetic series - ANS-- Sn = n/2 (2a + (n-1)d) - Sn = n/2 (a + l) where a is the first term and l is the last term what is an arithmetic series - ANS-the sum of the terms of an arithmetic sequence nth term of an arithmetic sequence - ANS-- Un = a + (n-1)d - a = the first term - d = the common difference nth term of a geometric sequence - ANS-- Un = ar^(n-1) - a = first term - r = common ratio formula of first n terms of a geometric sequence - ANS-- Sn = a(1-r^n) / 1-r - Sn = a(r^n - 1) / r-1 where r does not equal 1
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OCR a-level maths
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