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I'm confused. How do I solve these? you help is appreciated. Thank you 4. Four-digit numbers are formed using the digits 4, 5, 6, and

I'm confused. How do I solve these? you help is appreciated. Thank you
4. Four-digit numbers are formed using the digits 4, 5, 6, and 7, with repetition of digits allowed. How many such numbers can be formed if: a. the numbers are less than 7000? b. the numbers are odd? c. the numbers start with 7 and end with 7? 5. A company has 2844 employees. Each employee is to be given ID number that consists one letter followedby two digits. Is it possible to give each employee a different ID number using this scheme

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