4. (a) A box contains 9 tickets numbered from 1 to 9 inclusive. If 3 different tickets are drawn from the box one at a time, find the probability that they are alternatively either odd, even, odd or even, odd, even. (b) A manufacturer purchases two machines A and B. The probability that A will last five years is = and the probability that B will last five years is >. Find the probability that both machines will last five years; (ii) only machine A will last five years; (iii) at least one machine will last five years; (iv) neither machine will last five years