How many four digit numbers containing 5 can be formed?
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Step-by-step explanation:The other digits can be 0/1/2/3/4/6/7/8/9 - nine choices. This means 8*9*9*9 possibilities, or 5832 numbers without a five, and a total of 9000-5832=3168 numbers that contain a five. How many 3 digit numbers can be formed using the digits 1, 2, 3, 4, 5 without repeating a digit
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