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NDA Math Vector Algebra

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For the next four (04) items that follow:

\vec{a}+\vec{b}+\vec{c}=\vec{0}

and

|\vec{a}|=3,|\vec{b}|=5

and

|\vec{c}|=7

[NDA II 2014]

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Question : 97 of 101

Marks: +1, -0

What is

\left|\vec{a}+\vec{b}\right|

7
8
10
11

Solution:

\vec{a}+\vec{b}=-\vec{c}

\Rightarrow\left|\vec{a}+\vec{b}\right|=\left|-\vec{c}\right|=7

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