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anonymous
 5 years ago
Consider all positive integers with 7 digits (first digit not being zero.) How many of them are even and have all seven digits distinct?
anonymous
 5 years ago
Consider all positive integers with 7 digits (first digit not being zero.) How many of them are even and have all seven digits distinct?

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0\[9\times 9\times 8\times 7\times 6\times 5\times 4\]

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0left most digit can't be a zero, and then the next one can't be the one chosen previously, etc

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.09*9*8*7*6*5*4 = 544,320 which is incorrect. The hint I get is to consider all cases in which the digit is not zero. I am confused.
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