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Series basics challenge

n=1an=13+1415+\displaystyle\sum\limits_{n=1}^{\infty }{{{a}_{n}}}=-\frac{1}{3}+\frac{1}{4}-\frac{1}{5}+\cdots\,
Which of the following is the correct expression for  an~a_n?
Choose 1 answer:
Choose 1 answer: