jee-main 2022 Q64

jee-main · India · session2_29jul_shift2 Not Maths

$\sum_{r=1}^{20} (r^2 + 1) \cdot r!$ is equal to
(1) $22! - 21!$
(2) $22! - 2 \cdot 21!$
(3) $21! - 2 \cdot 20!$
(4) $21! - 20!$

$\sum_{r=1}^{20} (r^2 + 1) \cdot r!$ is equal to\\
(1) $22! - 21!$\\
(2) $22! - 2 \cdot 21!$\\
(3) $21! - 2 \cdot 20!$\\
(4) $21! - 20!$