Find the condition on the numbers a and b such that the table below gives the probability distribution of the random variable X. 
Definitions:
Sigmund Freud
An Austrian neurologist and founder of psychoanalysis, a clinical method for treating psychopathology through dialogue between a patient and a psychoanalyst.
Psychological Disorders
Mental disorders characterized by patterns of behavior or psychological symptoms that impact multiple areas of life.
"Talk Therapy"
A form of psychotherapy where verbal communication is used to explore and address psychological problems and issues.
Psychotherapy
A therapeutic treatment primarily involving talking and interaction with a mental health professional, aimed at resolving mental health issues or coping with life's stresses.
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