When two events (call them A and B) are Mutually Exclusive it is impossible for them to happen together: P(A and B) = 0. The probability of A and B together equals 0 (impossible).
Generation Z. Generation Z (also known as The Founders, Post-Millennials, the iGeneration, Plurals or the Homeland Generation) is the demographic cohort after the Millennials.
Gen X are those born between the early 1960s and the early 1980s. The nickname stuck thanks to the novel by Douglas Copeland: 'Generation X: Tales for an Accelerated Culture', which was about Americans hitting adulthood in the late 1980s. This generation has been characterised as being saddled with permanent cynicism.