On a certain day, 38 patients came to the clinic. Out of all the patients, 23 were having dental examination, 18 dental fillings and 8 tooth extraction. The number of patients
who underwent for dental examination and tooth extraction was one less then the
number of patients did dental examination and dental fillings. No patient was given
dental fillings and tooth extraction service.

1) Find the number of patients who came for tooth extraction only

2) Find the number of patients who came for dental examination and fillings​