Particles of masses 1kg and 3kg are at (2i+5j+13 k) m and (-6i+4j-2k) then instantaneous position of their centre of mass is

Particles of masses 1kg and 3kg are at (2i+5j+13 k) m and (-6i+4j-2k)

1.	Particles of masses 1kg and 3kg are at (2i+5j+13 k) m and (-6i+4j-2k) then instantaneous position of their centre of mass is
Answer» `(1)/(4)(-16i+17j+7k)m` `(1)/(4)(-8i+17j+7k)m` `(1)/(4)(-6i+17j+7k)m` `(1)/(4)(-6i+17j+5k)m` ANSWER :A