Which of the following statements is/are true?

(A) Three vectors not lying in a plane give zero resultant

(B) Three vectors lying in a plane can give zero resultant

(C) Two vectors of different magnitude can be combined to give a zero resultant

Forces A and B act at a point. The sum of their magnitudes is 50 N and the magnitude of their resultant is 20 N . If the resultant is at $90^{\circ}$ with the smaller force, the magnitudes of A and B , in N are

The square of resultant of two equal electric field vectors is three times their product. Angle between them is

If $$\alpha, \beta$$ and $$\gamma$$ are the angles between the vectors $$\overrightarrow{\mathrm{P}}, \overrightarrow{\mathrm{Q}}$$, and $$\overrightarrow{\mathrm{R}}$$ and $$\alpha=90^{\circ}$$ as shown in figure. the product of $$(\vec{Q} \times \vec{R}) \cdot \vec{Q}$$ is equal to