CUET Preparation Today
CUET
-- Mathematics - Section B1
Vectors
Let →a,→b,→c be three unit vectors such that →a+5→b+3→c=→0 Then →a.(→b×→c) is equal to:
→a.→b
→a.(→b+2→c)
→b.(→a+→c)
None of these
→a+5→b+3→c=→0
Thus →a,→b,→c are coplaner.
Hence →a.(→b×→c)=0
Hence (4) is correct answer.
