What are common multiples of 3 and 5

When y’all answer can y’all explain too !

If p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if

Which of these would have been most likely to have been a carpetbagger during the reconstruction era? a) a new york businessman who relocated to mississippi b) a former slave who was able to buy land in birmingham c) a carolina-born politician who supported the democratic d) a former confederate officer who owned a farm in memphis eliminate