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Suppose veca + vecb + vecc = 0, |veca| =...

Suppose `veca + vecb + vecc = 0, |veca| = 3, |vecb| = 5, |vecc| = 7`, then the angle between `veca & vecb` is

A

a.`pi`

B

b.`pi//2`

C

c.`pi//3`

D

d.`pi//4`

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The correct Answer is:
C
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