The value of _ r = 16 ^ 30 (r + 2)(r - 3) is equal to - Vidyadip

Question

The value of $\sum\limits_{r = 16}^{30} {(r + 2)(r - 3)}$ is equal to

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Answer

d
$\sum\limits_{r = 16}^{20} {({r^2} - r - 6 = 7780)}$

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