The simulation is done by picking 6 different 2-digit numbers from 01 to 49 to represent the winning numbers.
Assuming the numbers picked are: 22, 08, 19, 05, 24, 28
We also pick another set of 6 different 2-digit numbers from 01 to 49 to represent the numbers picked by Rosemary
Assuming the numbers Rosemary picked are: 36, 17, 18, 46, 49, 34
We repeat Rosemary's pick for as many samples as possible
Sample 2: 08, 06, 44, 09, 07, 18
Sample 3: 40, 08, 12, 22, 17, 49
Sample 4: 04, 30, 49, 07, 05, 21
Sample 5: 16, 44, 11, 04, 46, 15
Based on our 5 samples, the probability of
having at least one match in a set of five tickets is 2 / 5 = 40%.
Therefore, Rosemary should not be surprised that any of her numbers did not appear in the winning numbers.