(a) How many four-digit numbers can be formed from the digit 0, 1, 2, 3, 4,5, 6, 7 if each digit can be used only once (b) How many of these are even numbers? (c) How many are greater than 3,500?
Added by Christian S.
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- The first digit (thousands place) cannot be 0 (to ensure it's a four-digit number). So, we have 7 choices (1, 2, 3, 4, 5, 6, 7). - The second digit (hundreds place) can be any of the remaining 7 digits (including 0). - The third digit (tens place) can be any of Show more…
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