Two point-like objects of masses `20 gm` and `30 gm` are fixed at the two ends of a rigid massless rod of length `10 cm`. This system is suspended vertically from a rigid ceiling using a thin wire attached to its center of mass, as shown in the figure. The resulting torsional pendulum undergoes small oscillations. The torsional constant of the wire is `1.2 times 10^−8 N m rad^(−1)` . The angular frequency of the oscillations in `n times10^(−3)rad s^(−1)` . The value of n is _____.