$\mathrm{n} \in \mathrm{Z}$ হলে— $\text { i. } \quad i^{4 n}=1$ $\text { ii. }(\mathrm{i})^{2 \mathrm{n}+1}=-1$ $\text { iii. }(\text { i })^{8 n+4}=1$ নিচের কোনটি সঠিক?

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