Question

12 defective pens are accidently mixed with 132 good ones. It is not possible to just look at 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 good one.

Answer 1

Answer: 11/12

Step-by-step explanation:

total number of pens = 132 + 12 = 144

P (getting a good pen) = 132/144 = 11/12

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Answer 2

SOLUTION :

Given : Number of defective pens = 12

Number of good pens = 132

Total number of ball pens = 12 + 132 = 144

Total number of outcomes = 144

(i) Let E = Event of buying a good  pen  

Number of good pens = 132

Number of outcome favourable to E = 132

Probability (E) = Number of favourable outcomes / Total number of outcomes

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

Hence, the required probability of buying a good ball pen , P(E) = 11/12 .

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