A study was done to determine the efficacy of two different headache tablets – A and B. The 2500 study participants used the two tablets (at different times) over the period of the study. Results indicated that 1,649 reported relief from tablet A, 1,746 reported relief from tablet B, and 1,136 reported relief from both tablets A and B. If a study participant is selected at random, what is the probability that he/she reported relief from tablet A or tablet B? Round your answer to four decimal places.