Question 5.323

110. China's Groundwater Problem. The Web site http://chinawaterrisk.org reports that 60% of China's underground water sources are polluted.

  1. Find the probability that two randomly selected underground water sources are polluted.
  2. Find the probability that three randomly selected underground water sources are polluted.
  3. Find the probability that at least one of three randomly selected underground water sources is polluted.