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.