Question

In a box, there are 30 damaged bulbs and some good bulbs.If the probability of getting a good bulb is 1/4.Find the number of good bulbs?​

Answer 1

Answer:

189/190

Step-by-step explanation:

There are 17 good bulbs and 3 defective bulbs.

Probability of having atleast one good bulb in selected 3 bulbs is equal to one minus probability of having 0 good bulbs.

Probability of selecting 0 good bulbs is  

20

C  

3

​  

 

3!

​  

=  

190

1

​  

.

Therefore probability of selecting atleast one good bulb is 1−  

190

1

​  

=  

190

189

​  

.

Its Helpful For You Plz MArk As Brainlist