# SOLUTION: Of 10 electric bulbs,three are defective but it not known which are defective. in how many ways can 3 bulbs be selected? how many of these selections will include at least one defe

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 Question 702800: Of 10 electric bulbs,three are defective but it not known which are defective. in how many ways can 3 bulbs be selected? how many of these selections will include at least one defective bulb? please explain it in step by step when doing the calculation.Answer by stanbon(60778)   (Show Source): You can put this solution on YOUR website!Of 10 electric bulbs,three are defective but it not known which are defective. in how many ways can 3 bulbs be selected? Ans: 10C3 = 120 ---------------------------- how many of these selections will include at least one defective bulb? # that have NO defective is 7C3 = 35 # with at least one defective is 120-35 = 85 ---------------------------------------------------- Cheers, Stan H. ===================== please explain it in step by step when doing the calculation.