(i(a))[4]
All nine cards are laid out in a row, forming a 9-digit number. Determine how many different 9-digit numbers can be formed in this way if all the even digits are adjacent.
(i(b))[3]
All nine cards are arranged in a line, producing a 9-digit number. Determine how many different 9-digit numbers can be formed in this way if the first and last digits are both odd.
(ii(a))[2]
Three of the nine cards are selected and arranged in a line to form a 3-digit number. Determine how many different numbers can be formed in this way if no digit is repeated.
(ii(b))[2]
Three of the nine cards are selected and arranged in a line to form a 3-digit number. Determine how many different numbers can be formed in this way if the number is between 200 and 300.