1.b is defined by bn = n(−1)n, n ≥ 1 (a) Find Σ when 4 is on top, i=1 at the bottom and bi at the right hand side (b) Is b increasing, decreasing, non-increasing or non-decreasing?
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(a)
(b)
The sequence is alternating.
The alternating sequence is neither increasing nor decreasing .