Question

15 defective pens are accidentally mixed up with 135 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.​

Answer 1

Answer:

Good pens+Defective pens = 135+15=150

n(s)=150

P(A)=

n(S)

n(A)

=

150

135

=

10

9

Answer 2

Answer:

1/135

Step-by-step explanation:

Total no. of good pens - 135

No. of pens taken out - 1

P - no. pens taken out /total no. of good pens

P(taking a good pen) - 1/135

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