Question

A box contains 3 white balls and 7 black balls. Another box contains 4 white balls and 6 black balls. If we choose one ball each from the two boxes without looking into the boxes,
a) What is the probability of getting two balls with the same colour?
b) What is the probability of getting two balls with different colours?​

Answer 1

Answer:

the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product.

Answer 2

Answer:

Correct option is

A

12

Let the number of black balls be x, then,

Total number of balls =30+x

Thus, the probability of black balls =30+xx

and the probability of white balls =30+x30

Given: Probability of black ball =52× probability of white ball

30+xx=52×x+3030

5x=60

x=12

Hence, the number of black balls =12