1.

I : If a,b,c,d are four vectors then [b c d] a + [c a d] b + [a b c] c = [a b c]d II : The points with position vectors a,b,c,d are coplanar then [a b d] + [b c d] + [c a d] = [a b c]

Answer»

only I is ture
Only II is ture
both I and II are true
Neither I nor II are true

Answer :C


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