Question

there are 144 bulbs in a box in which 20 are damaged. one bulb is drawn randomly from the box ,find probability of damaged bulbs and not damaged ​

Answer 1

Answer:

probability of getting damage bulbs equal to 20 by 144 and probability of getting on tamij bulbs are 124 by 144

Answer 2

Probability of damaged bulbs =  $\frac{5}{36}$

Probability of not damaged bulbs = $\frac{31}{36}$

Step-by-step explanation:

Given:

Total number of bulbs = 144

Number of damaged bulbs = 20

One bulb is randomly drawn from the box.

To find the probability of damaged bulbs and not damaged bulbs.

Solution:

Probability of damaged bulbs can be given as:

⇒ $\frac{Number\ of\ damaged\ bulbs}{Total\ number\ of\ bulbs}$

⇒  $\frac{20}{144}$

Reducing to simpler fractions by dividing by their HCF.

⇒ $\frac{20\div 4}{144\div 4}$

⇒ $\frac{5}{36}$

Number of undamaged bulbs = $144-20=124$

Probability of damaged bulbs can be given as:

⇒ $\frac{Number\ of\ not\ damaged\ bulbs}{Total\ number\ of\ bulbs}$

⇒  $\frac{124}{144}$

Reducing to simpler fractions by dividing by their HCF.

⇒ $\frac{124\div 4}{144\div 4}$

⇒ $\frac{31}{36}$