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.
Members of Generation Y (also known as Gen Y or Millennials) were born in the 1980s and early 1990s, the loose definition that separates them from the generation before them (Generation X) and the generation that followed (Generation Z).