Two six- sided (balanced) dice are thrown. Find the probabilities of each of the following events:
(a) A 5 does not occur on either throw;
(b) The sum is 7;
(c) A 5 and a 3 occur in any order;
(d) The first throw is a 5 and the second throw is a 5 or a 4;
(e) Both throws are 5;
(f) Either throw is a 6.