Decide if the conditions of the alternating series test are satisfied by these series?

some kid

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Decide for each series if the conditions of the alternating series test are satisfied.

a. sum(n=1 to infinity) (-1)^n / (sqrt(n) + 1)
b. sum(n=1 to infinity) ((-1)^n sin(n)) / (n^6 +1)
c. sum(n=1 to infinity) (-1)^n / (n!)^2

thanks in advance!
 
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