1.

I : For any vector a, (a xx i)^(2) + (a xx j)^(2) + (a xx k)^(2) = 2a^(2) and (a. i)^(2) + (a.j)^(2) + (a.k)^(2) = a^(2) II : If (2i + 4j + 2k) xx (2i - xj + 5k) = 16 I - 6j + 2xk then x = 2

Answer»

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

Answer :A


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