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Infinite Seriesmedium
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Which of the following series CONVERGE? (Select all that apply)

a) ∑n=1∞1n2/3\sum_{n=1}^{\infty} \frac{1}{n^{2/3}}

b) ∑n=1∞1n\sum_{n=1}^{\infty} \frac{1}{n}

c) ∑n=1∞1n3/2\sum_{n=1}^{\infty} \frac{1}{n^{3/2}}

d) ∑n=1∞12n\sum_{n=1}^{\infty} \frac{1}{2^n}