A box contains 130 good pen and 14 defective pen . what is probability to get a good pens
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Total no. of pens is 144 (132 good and 12 defective ones)
No. of good ones is 132
Therefore, 132 times out 144 a good pen is taken out.
Let E be the event of taking a pen out.
We know that, Probability P(E) =
(Total no.of possible outcomes)
(No.of favorable outcomes)
=
144
132
=
12
11
Therefore, the probability that the pen taken out is good one =
12
11
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