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

MCQ

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

A
5
B
12
C
21
✓
32

✓

Answer

Correct option: D.

32

32

Solution:
$a_1=2 \times 1+3=5, a_2=2 \times 2+3=7, a_3=2 \times 3+3=9, a_4=2 \times 4+3=11$
$\text { Sum }=5+7+9+11=32$

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