Answer
$15150$
Work Step by Step
We need to use the formula $ S_n=\dfrac{n(a_1+a_2)}{2}$
Here, $ a_1=3$ and $ n=100$
Now, $ S_n=\dfrac{n(a_1+a_2)}{2}$
and $ S_{100}=\dfrac{100(3+300)}{2}=15150$
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