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If vec(a)+vec(b)+vec(c )=0 and |vec(a)|=...

If `vec(a)+vec(b)+vec(c )=0 and |vec(a)|=3, |vec(b)|=5, |vec(c )|=7 and (vec(a),vec(b))= alpha`, then `alpha`= ____

A

(a) `(2pi)/(3)`

B

(b) `(pi)/(6)`

C

(c) `(pi)/(3)`

D

(d) `(5pi)/(6)`

Text Solution

Verified by Experts

The correct Answer is:
C
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