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Nakul jha
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Asked: 2020-10-29T05:55:11+00:00 In:

(i) A lot of 20 bulbs contain 4 defective ones. One bulb is drawn at random from the lot. What is the probability that this bulb is defective? (ii) Suppose the bulb drawn in (i) is not defective and is not replaced. Now one bulb is drawn at random from the rest. What is the probability that this bulb is not defective ?

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NCERT Solutions for Class 10 Maths Chapter 15
Important NCERT Questions
PROBABILITY
NCERT Books for Session 2022-2023
CBSE Board and UP Board Others state Board
EXERCISE 9.1
Page No:309
Questions No:17

2020-2021cbsechapter 15class10mathematicsncertprobability
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    2 Answers

    1. Get Hindi Medium and English Medium NCERT Solution for Class 10 Maths to download.
      Please follow the link to visit website for first and second term exams solutions.
      https://www.tiwariacademy.com/ncert-solutions/class-10/maths/chapter-15/

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    2. Best Answer

      (i) Total number ofbulbs = 20
      Total number of defective bulbs =4
      P(getting a defective bulb) = (Number of favourable outcomes)/(Number of total possible outcomes) = 4/20 = 1/5
      (ii) Remaining total number of bulbs = 19
      Remaining total number of non-defective bulbs = 16 – 1 = 15
      P(getting a not defective bulb) = (Number of favourable outcomes)/(Number of total possible outcomes) = 15/19

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