^ 4 _ i = 1 2n+3=............ - Vidyadip

MCQ

$\sum\limits^{4}_{\text{i = 1}}2\text{n}+3=............$

A
$5$
B
$12$
C
$21$
✓
$32$

✓

Answer

Correct option: D.

$32$

$a_1 = 2 \times 1 + 3 = 5,$
$a_2 = 2 \times 2 + 3 = 7,$
$a_3 = 2 \times 3 + 3 = 9,$
$a_4= 2 \times 4 + 3 = 11.$
Sum $= 5 + 7 + 9 + 11 = 32.$

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