1.

I : If the vectors a = (1, x, -2), b = (x, 3, -4) are mutually perpendicular, then x = 2 II : If a = I + 2j + 3k, b = - I + k, c = 3i + j and a + b is perpendicular to c then t = 5.

Answer»

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

Answer :B


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