The probability that a mechanic making an error while using a machine on the 
th day is given by 
.
If he has operated the machine for 4 days, the probability that he had not made a mistake on 3 of 4 days is
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The probability of a mechanic making an error while using a machine on 
th day is 
.
Since, machine operated for 4 days, so probability of making an error for 
day, 
and 
day is
respectively.
Now, the probability that it had not make a mistake on 3 out of 4 is
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