Question on: JAMB Mathematics - 2006

The sum of the first n positive integers is
A
\(\frac{1}{2}\)(n + 1)
B
n \(\frac{1}{2}\)(n + 1)
C
n(n - 1)
D
n(n + 1)
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Correct Option: B
Sn = \(\frac{n}{2}\)(a(n - d)d)

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