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College Algebra & Trigonometry, 2018a

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6.4. SUM OF A SERIES 303<br />

17)<br />

∞∑<br />

( ) k−1 4<br />

18)<br />

3<br />

k=1<br />

∞∑<br />

( k−1 3<br />

2)<br />

k=1<br />

19)<br />

∞∑<br />

(<br />

− 1 k+2<br />

20)<br />

3)<br />

k=1<br />

∞∑<br />

(<br />

− 1 2<br />

k=1<br />

) k+4

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