Question

1.11 defective bulbs are accidentally mixed with 121 good ones. One ball is taken out at random from this lot. Find the probability that the ball taken out is a good one. 1. 1/12 2. 7/12 3. 11/12 4. 1/11

Answer 1

probability = No. of favorable outcomes / total number of outcomes 

P(good bulb) = 121-11/121 = 110/121 = 10/11 

Answer 2

Answer:

Step-by-step explanation:

No. Of defective bulbs = 11

No of good ones =121

Total bulbs=121+11

=132

E=probability of taking the good one

P(E)=no.of events occurred/total no. of events

= 121/132

= 1/11

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