Question: codes with 4 digits are to be made from the digits 1 , 2 , 3 , 4 , 5 , 6 and 7 .

codes with

4

digits are to be made from the digits

1, 2, 3, 4, 5, 6

and

7 .

if repetitions are not permitted and each code must contain two odd digits followed by two even digits afterwards, then what are the total number of codes that can be formed

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