Question (figure)

Answer = 5, The question is itself mentioning the answer. They have mistakenly written the number of phases=5, which is the answer in actual. As you know that, F=C-P+2, for invaria...

P+F=C+2 P=PHASE F=DEGREE FREEDOM C=components 2 represents pressure, temperature 5 phase must be present for this 3componet system having degree of freedom zero./invariant. P+F=0...