![]() Sum of the finite geometric series (sum of first 'n' terms), S n = a (1 - r n) / (1- r).n th term of geometric sequence, a n = a r n - 1., where 'a' is the first term and 'r' is the common ratio. Sum of the arithmetic series, S n = n/2 (2a + (n - 1) d) (or) S n = n/2 (a + a n)Ĭonsider the geometric sequence a, ar, ar 2, ar 3.n th term of arithmetic sequence, a n = a + (n - 1) d., where 'a' is its first term and 'd' is its common difference. Arithmetic Sequence and Series FormulasĬonsider the arithmetic sequence a, a+d, a+2d, a+3d, a+4d. Let us see each of these formulas in detail and understand what each variable represents. The figure below shows all sequences and series formulas. In a harmonic sequence, the reciprocals of its terms are in an arithmetic sequence. In a geometric sequence, there is a common ratio between consecutive terms. In an arithmetic sequence, there is a common difference between two subsequent terms. ![]()
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