z2020 +1 7. The integral fz-4|== -dz is ( ). Z-1 Α). 2πί Β). 0; C). 2020; D) . do not exist. 8. Choose a convergent seri
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z2020 +1 7. The integral fz-4|== -dz is ( ). Z-1 Α). 2πί Β). 0; C). 2020; D) . do not exist. 8. Choose a convergent series from the following series ( ). A). Σ B). En=1* (1) (3+41)" ; C). Σn=o ; D). Σ=o(1 – i)" . η n n! (2-1)" 9. The radius of convergence of series En=1 is ( ). n+2021 A). 1; Β). 2020; C). 2; D). 3.