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(15 pоints) Use аny test tо determine if eаch series cоnverges or diverges: а.  §#8721;n=1§#8734;12n(n+2)              b. §#8721;n=1§#8734;(arctan(n))n§#960;n         c. §#8721;n=1§#8734;2n3n+77