Given the digits: 3 ; 4 ; 5 ; 6 ; 7 ; 8 and 9
11.1 Calculate how many unique 5-digit codes can be formed using the digits above, if:
11.1.1) The digits may be repeated (2)
11.1.2) The digits may not bc repeated (2)
11.2 How many unique 3-digit codes can be formed using the above digits, if:
- Digits may be repeated
- The code is greater than 400 but less than 60
- The code is divisible by 5 (3)
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