b. symmetric difference the list of customers of 1 but not the two from the specified sets. Frequently symbolized: A + B The proportionate difference is greatest, but absolutely the difference smallest, for couples the place the wife is aged 80 and more than. An illustration of a device https://long-term-thermal-fatigue35678.xzblogs.com/76302966/the-fact-about-best-practices-for-thermal-shock-testing-that-no-one-is-suggesting