OPIC: Permutation / Combination. Pls these 2 number are connected so, I can't cut it off.  Suppose you used combination lock to secure your bike. Later, you realized that you forgot the 5-digit code.  You only remembered that the code contains the digits 9, 4, 3,1 and 0.  How many possible codes are there?             A. 120          B. 24          C. 48                            D. 625   In problem #1, if the first digit is an odd number, how many possible codes are there? A. 120               B. 24                            C. 48                            D. 625

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