Q 1713267149.     Let a vector r make angles `60^0`,
`30^0` with `X` and `Y`-axes, respectively.

What angle does `r` make the `Z`-axis?

NDA 2014 Paper 1 April
A

`30^0`

B

`60^0`

C

`90^0`

D

`120^0`

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