70-77. Sequences of partial sums Consider the following infinite series. a. Write out the first four terms of the sequence of partial sums. b. Estimate the limit of {S,} or state that it does not exist. 70. E cos rk 71. Σ 9(0.1)* 72. Σ1.5t 73. Σ 3 74. Σ 75. Σ(-1) 76. 2(-1)* k 77. 10* k=1

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