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Ex 15.1, 16 - 12 defective pens are accidentally mixed with 132 - Ex 15.1

  1. Chapter 15 Class 10 Probability
  2. Serial order wise
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Ex15.1, 16 12 defective pens are accidentally mixed with 132 good ones. It is not possible to just look at a pen and tell whether or not it is defective. One pen is taken out at random from this lot. Determine the probability that the pen taken out is a good one. Total number of pens = Total defective pens + Total good pens = 12 + 132 = 144 Number of good pens = 132 P (getting a good pen) = (𝑁𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑔𝑜𝑜𝑑 𝑝𝑒𝑛𝑠)/(𝑇𝑜𝑡𝑎𝑙 𝑛𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝑝𝑒𝑛𝑠) = 132/144 = 11/12

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Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He provides courses for Mathematics from Class 9 to 12. You can ask questions here.
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