A level Maths year 1 - equations for sequences 0.0 / 5 ? MathematicsSequences and seriesA2/A-levelEdexcel Created by: 14imogehalliCreated on: 14-10-20 15:46 Nth term of an arithmetic sequence Un = a + (n-1)d a = the first term d = the common difference 1 of 5 Sum of the first N terms of an arithmetic sequence Sn = o.5 x n x (a +l) Sn = 0.5 x n x [2a + (n-1)d] a = first term l = last term d = common difference n = number of terms 2 of 5 Nth term of a geometric sequence Un = ar^n-1 a = first term r = common ratio 3 of 5 Sum of the first N terms of a geometric sequence Sn = a(r^n - 1)/ r-1 Sn = a(1 - r^n)/ 1-r a = first term r = common ratio n = number of terms 4 of 5 Sum to infinity of a geometric sequence S = a/ 1-r a = first term r = common ratio 5 of 5
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