Statement: Some doctors are lawyers. All teachers are lawyers. Some engineers are lawyers. All engineers are businessmen. Conclusions: I. Some teachers are doctors. II. Some businessmen are lawyers. III. Some businessmen are teachers. IV. Some lawyers are teachers.

All teachers are lawyers (A) → conversion → Some lawyers are teachers (I). Hence IV follows. Now, Some doctors are lawyers + Some lawyers are teachers = I + I = No conclusion Hence I does not follow. Some engineers are lawyers (I) → conversion → Some lawyers are engineers + All engineers are businessmen = I + A = I = Some lawyers are businessmen → conversion Some businessmen are lawyers Hence II follows. But , All teachers are lawyers + Some lawyers are businessmen = A + I = No conclusion Hence III does not follow.