A 5-digit code is to be formed from the digits \(1,2,3,4,5,6,7,8,9\). Each digit can be used once only in any code. Find how many codes can be formed if

(i) the first digit of the code is \(6\) and the other four digits are odd,

(ii) each of the first three digits is even,

(iii) the first and last digits are prime.