The sum of the first $n$ terms of an $A.P.$ is given by $S_{n} = \ldots \ldots \ldots \ldots$
- A$n[2a + (n - 1)d]$
- B$\frac{1}{2} n[2a + (n - 1)d]$
- C$\frac{1}{2} n[a + (n - 1)d]$
- D$\frac{1}{2} n[2a + (n + 1)d]$
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