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

MCQ

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

A
$7770$
B
$7785$
C
$7775$
✓
$7780$

✓

Answer

Correct option: D.

$7780$

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

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