These conditions are strict!
There exists many four digit positive integers that satisfies:
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The digits are all different.
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The first digit is not 0(of course!)
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The second digit is not 1 or 2
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The third digit is not 3 or 4 or 5
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The fourth digit is not 6 or 7 or 8 or 9
How many numbers satisfies the above conditions?
Bonus: Find the sum of them.
The answer is 1634.
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