<h2>
Answer:</h2>
The probability that all three numbers are even numbers is:
<h2>
Step-by-step explanation:</h2>
There are seven balls numbered as: 1-7
and the number of even numbers are: 3 ( i.e. 2,4 and 6 )
Three balls are chosen without replacement.
Hence, the probability that all three numbers are even numbers is given by:
Ratio of number of favorable outcomes to the total number of outcomes.
Hence, the probability is:
where the numerator represents that the balls drawn have even numbers.
and the denominator denote the choosing of 3 balls out of a total of 7 balls.
Hence, the probability is: