Question: A bank provides two different kind of bank account: current accounts and savings\r\naccounts. Every bank customer has one or both of these. 90% of bank customers have\r\ncurrent accounts and 60% of bank customers have savings accounts. If a customer is\r\nchosen uniformly at random from the set of all bank customers, calculate the following\r\nprobabilities, showing your working in each case:\r\na) The probability they have a current account or a savings account.\r\nb) The probability they have a current account and a savings account.\r\nc) The probability they have a current account but not a savings account.\r\nd) The probability they do not have a savings account, given that they have a\r\ncurrent account.  Edit