SOLUTION: A school supply store test 5 out of every 100 pens to make sure they work. To check the quality control department, the boss places two defective pens in with 98 good ones. How man

Question 502923: A school supply store test 5 out of every 100 pens to make sure they work. To check the quality control department, the boss places two defective pens in with 98 good ones. How many days could a sample of five of these pens have at least one defective pen? Leave your answer in P/C form....please help I don't even know where to start
Answer by sudhanshu_kmr(1152) (Show Source): You can put this solution on YOUR website!
Number of ways to select 5 pens out of 100 = 100 C 5
Number of ways to select 5 pens where all are good = 98 C 5

Required number of ways = 100 C 5 - 98 C 5

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