my question

3. A maintenance firm has gathered the following information regarding the failure mechanisms for air conditioning evidence of gas leaks yes no evidence of yes 55 17 electrical failure no 32 3 The units without evidence of gas leaks or electrical failure showed other types of failure. If this is a representative sample of AC failure, find the probability (a) That failure involves a gas leak (b) That there is evidence of electrical failure given that there was a gas leak (c) That there is evidence of a gas leak given that there is evidence of electrical failure