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If veca + vecb + vecc = 0, |veca| = 3, |...

If `veca + vecb + vecc = 0, |veca| = 3, |vecb| = 5 and |vecc| = 7, ` then the angle between `veca and vecb` is : a)`pi/3` b)`pi/2` c)`cos ^(-1) (( 2)/(225))` d)`(pi)/(4)`

A

`pi/3`

B

`pi/2`

C

`cos ^(-1) (( 2)/(225))`

D

`(pi)/(4)`

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The correct Answer is:
A
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