If 18 persons are in a room, 1-9 areinfected with COVID, if 3 tests randomly conducted, likelihood that all 3 will come back negative? For each case 1-9 infected the~~ same situation, with 2 infectied persons, and the same situation with 3 infected persons....up to 9 infected persons, all situations with 3 tests randomly conducted.~~

bradpepi May 22, 2022