The first term of an $A.P.$ is denoted by $\ldots \ldots \ldots \ldots .$
- A$d$
- B$a$
- C$l$
- D$n$
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Find the sum:
$4-\frac{1}{n}+4-\frac{2}{n}+4-\frac{3}{n}+\ldots$ up to $n$ terms.
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