31 candidates appeared for an examination, 15 candidates passed in Mathematics, 15 candidates passed in physics, 20 candidates passed in Chemistry, 3 candidates passed only in Mathematics, 4 candidates passed only in Physics. 7 candidates candidates passed only in Chemistry. 2 candidates passed in all the three subjects. How many candidates passed only in two subjects?
a) 17 b) 15 c) 22 d) 14
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