E
Editor
Sep 18, 2022
The sum of first n terms of an arithmetic series is
Difficulty: Easy
A:
a+(n-1)d
B:
$\frac{n}{2}(a_{1}+a_{2})$
C:
$\frac{n}{2}[a+(n-1)d]$
D:
n[2a+(n-1)d]
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ID: 63273dbaca83163ac3a12b9d