MCQ
$(A’)’ = ?$
- A$\cup-\text{A}$
- B$\text{A}'$
- C$\cup$
- ✓$\text{A}$
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$(A)$ $\left|z+\frac{1}{2}\right| \leq \frac{1}{2}$ for all $z \in S$ $(B)$ $|z| \leq 2$ for all $z \in S$
$(C)$ $\left|z+\frac{1}{2}\right| \geq \frac{1}{2}$ for all $z \in S$ $(D)$ The set $S$ has exactly four elements
$\frac{3}{1^2} + \frac{5}{{{1^2} + {2^2}}} + \frac{7}{{{1^2} + {2^2} + {3^2}}} + ...... + $ up to $20$ terms is equal to $\frac{k}{{21}}$, then $k$ is equal to