b. symmetric difference the set of users of 1 although not equally from the presented sets. Usually symbolized: A + B This study highlights numerous differences in how that teenage girls and boys in the UK expend their free time. A lot of people mix up “difference” and “diference.” https://thermalcyclingreliability25689.blogitright.com/35876577/how-much-you-need-to-expect-you-ll-pay-for-a-good-difference-between-thermal-shock-and-cycling