lim(n→∞) (-3)^n+1/1-3+9-...+(-3)^n-1
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lim(n→∞) (-3)^n+1/1-3+9-...+(-3)^n-1
lim(n→∞) (-3)^n+1/1-3+9-...+(-3)^n-1
lim(n→∞) (-3)^n+1/1-3+9-...+(-3)^n-1
lim(n→∞) [(-3)^n+1]/[1-3+9-...+(-3)^n-1]
=lim(n→∞) [(-3)^n+1]/{[(-3)^n -1]/[-3-1]}
= -4*lim(n→∞) [(-3)^n+1]/[(-3)^n -1]
= -4*lim(n→∞) [ 1 + 1/(-3)^n ]/[1 - 1/(-3)^n ]
= -4
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