Hey! In order to find out the probability that they will both choose an odd number, you need to follow a few different steps.
First, count how many numbers there are between one and ten. This will be your denominator. Next, count how many of the numbers between one and ten are odd. This will be your numerator.
5 odd numbers / 10 numbers total.
The probability either of them will choose and odd number is 5/10 or 50%.
Since we want to see the probability that they will BOTH choose an odd number, we have to multiply these two probabilities together. That means ½ x ½ which equals ¼ or 25%.
Therefore, the probability they will both choose an odd number is 25%.
I hope this helps!