If a = i + 4j, b = 2i - 3j and c = 5i + 9j then c =

I : If a = i + 4j, b = 2i - 3j, c = 5i + 9j then c = 3a + b II : If a = 3i - 6j + 2k then the length of the vector is 3.

If a = i + j, b = j + k and c = i + k then a unit vector in the direction of a - 2b + 3c is

If a = i - j + 2k, b = 2i + 3j + k, c = i - k , then magnitude of a + 2b-3c is

If a = i + j + k, b = 2i + 3j, c = 3i + 5j - 3k and d = k + j, then the ratio of moduli of b - a and d - c is

If a = 3i - 2j + k, b = 2i - 4j - 3k, c = -i + 2j + 2k then a + b + c =

If a = i- 2j + k, b = 2i + j - k, c = 4i + 4j + 3k then |(a xx b) xx c| =

I : If a = 3i - 2j + k, b = 2i - 4j - 3k, c = -i + 2j + 2k then a + b + c = 4i + 4j II : If a = i - j + 2k, b = 2i + 3j + k, c = i - k, then magnitude of a + 2b - 3c is sqrt(78)

If a = 2i + 3j - 4k, b = I + j + k and c = 4i + 2j + 3k, then |a xx (b xx c)| =

If a = I + j - k, b = I - j + k, c = I - j - k then a xx (b xx c) =

If a = 2i - j + 3k, b = -i + 4j - 2k, c = 5i + j + 7k and xa + yb = c then (x, y) =