There are 7 white and 3 black balls in the urn. one ball is taken out

There are 7 white and 3 black balls in the urn. one ball is taken out of the urn for good luck, what is the probability that the removed ball is white.

The first step is to determine the total number of balls in the urn.
To do this, add 7 white and 3 black balls.
As a result, we get 7 + 3 = 10 balls.
To find the probability that the ball taken out of the urn will be white for good luck, you need to divide the total number of white balls by the total number of balls.
As a result, we get a probability equal to 7/10 or 0.7.
Answer: The probability that the ball taken out of the urn will be white for good luck is 0.7.