A medical research study on a new medicine for multiple sclerosis is being conducted with

26

patients. After the study was concluded, it was determined that

16

patients reacted favorably to the medicine,

7

reacted unfavorably, and

3

were unaffected. If three of the patients are randomly selected, determine the probability that none of the patients reacted favorably.

The probability is

enter your response here.

(Type an integer or a simplified fraction.)