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a 4 digit code is to be formed using 4 different numbers selected from 2345678 and 9 find how many possible codes there are if the code forms a number that is odd and greater than 5000 60674

Given the set of numbers {2,3,4,5,6,7,8}. a. How many different three-digit numbers can be formed? b. How many different three-digit numbers can be formed if the number cannot have repeated digits? c. How many different three-digit numbers can be formed if the number is to be even and repetition of digits is allowed? | Numerade