NIMCET 2020 — Reasoning PYQ

If there are no dancers that aren't slim → Implies all dancers are slim.
No singers that aren't dancers → All singers are dancers.
Thus from the above two it can be concluded that all singers are dancers and all dancers are slim, so all singers are slim.
1)There is not one slim person that isn't a dancer. → False (It is possible but not definite)
2)All singers are slim → True (It is definite)
3)Anybody slim is also a singer → False (It is possible but not definite)
4)None of the above. → False (As option 2 is true)
Hence, ‘All singers are slim’ is the correct answer.