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How do you calculate probability ?

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How do you evaluate $\sum_{i=1}^{100}\left(4+3i\right)$100∑`i`=1(4+3`i`) ?

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$4\left(100\right)+3\left\{\frac{100\left(100+1\right)}{2}\right\}$4(100)+3{100(100+1)2}

= 15,550