CBSE (Arts) Class 11CBSE
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Concept of Series

Let a_1, a_2, a_3,…,a_n, be a given sequence. Then, the expression
a_1 + a_2 + a_3 +,…+ a_n + ...
Thus the series a_1 + a_2 + a_3 +...+a_n is  abbreviated as sum _(k=1)^n a_k.