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NDA Math Vector Algebra

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For the next two (02) items that follow:

Let

\left|\overset{\rightarrow}{a}\right|=7,\left|\overset{\rightarrow}{b}\right|=11,\left|\overset{\rightarrow}{a}+\overset{\rightarrow}{b}\right|=10\sqrt{3}

[NDA I 2014]

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Question : 100 of 101

Marks: +1, -0

\text{ What is }\left|\vec{a}-\vec{b}\right|\text{ equal to? }

$2\sqrt{2}$
$2\sqrt{10}$
5
10

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