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Classify this serieses whether its absolute convergence or conditional convergence or diverge (1) sigma n=1 to...

Classify this serieses whether its absolute convergence or conditional convergence or diverge

(1) sigma n=1 to infinity (-1)^(n+1) * 1/square root(n(n+1))

(2) sigma n=1 to infinity sin(n(pi)/2)/n^2

I would be very thankful if the answer is back with solution within 30mins

Thank you in advance

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