A lot consists of 144 ball pens of which 20 are defective and the others are good. Nuri will buy 

Class 10 || Chapter Probability Ex :- 15.1 || Question no.21 A lot consists of 144 ball pens of which 20 are defective and the others are good. Nuri will buy a pen if it good, but will not buy if it is defective. The shopkeeper draws one pen at random and give it to her. What is the probability that
(i) she will buy it?
(ii) she will not buy it?
Probability Chapter
Introduction • Class 10 || Chapter 15...
Ex :- 15.1
Question no.1 (i)(ii)(iii)(iv)(v) • Class 10 ll Chapter Pr...
Question no.2 (i)(ii)(iii)(iv) • Class 10 ll Chapter Pr...
Question no.3 • Why is tossing a coin ...
Question no.4 and 5 • Class 10 ll Chapter Pr...
Question no.6 and 7 • Class 10 Chapter Proba...
Question no.8 • A bag contains 3 red b...
Question no.9 (i)(ii)(iii) • A box contains 5 red m...
Question no.10 (i)(ii) • A piggy bank contains ...
Question no.11 • Gopi bugs a fish from ...
Question no.12 • A game of chance consi...
Question no.13 • A dice is thrown once....
Question no.14 • One card is drawn from...
Question no.15 • Five cards the ten, ja...
Question no.16 • 12 defective pens are ...
Question no.17 • Class 10 ll Chapter Pr...
Question no.18 (i)(ii)(iii) • A box contains 90 disc...
Question no.19 (i)(ii) • A child has a die whos...
Question no.20 • Suppose you drop a die...
Question no.21 (i)(ii) • A lot consists of 144 ...
Question no.22 (i) • Refer to Example 13. (...
(ii) • A student argues that ...
Question no.23 • A game consists of tos...
Question no.24 (i)(ii) • A die is thrown twice....
Question no.25 (i)(ii) • Which of the following...
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