Time management is very much important in IIT JAM. The eduncle test series for IIT JAM Mathematical Statistics helped me a lot in this portion. I am very thankful to the test series I bought from eduncle.
Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Swapnadeep goswami
The degeneracy of the n th level of a 3D isotropic harmonic oscillator is given by (n+1)(n+2)/2 . So for n=2 the degeneracy is (2+1)(2+2)/2= 6. So the 2nd option is correct.
thank you