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: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.

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Total number of pens = 12 + 132 = 144

Total number of good pens = 132

P(getting a good pen) = (Number of favourable outcomes)/(Number of total possible outcomes) = 132/144 = 11/12