3 pens

3 pens are to be taken from a bunch of 100 pens.If 10 pens are defective, find probability of getting all good pens.

Correct answer:

p =  0.729

Step-by-step explanation:

p1=10010=101=0.1 p2=1p1=10.1=109=0.9  p=(33)p23(1p2)33=(33)0.93(10.9)33=10.930.10=0.729



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