Last updated at May 29, 2018 by

Transcript

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) = ( )/( ) = 132/144 = 11/12

Ex 15.1

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Ex 15.1, 16 You are here

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Ex 15.1, 20* (Optional) Important

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Ex 15.1, 25 (ii)

About the Author

Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.