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If ` vec a+ vec b+ vec c= vec0,\ | vec a|=3,\ | vec b|=5,\ | vec c|=7` then the angle between ` vec a\ a n d\ vec b` is `pi/6` b. `(2pi)/3` c. `(5pi)/3` d. `pi/3`

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To solve the problem, we start with the equation given: \[ \vec{a} + \vec{b} + \vec{c} = \vec{0} \] From this, we can rearrange it to express one vector in terms of the others: ...
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