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A seven-digit number without repetition ...

A seven-digit number without repetition and divisible by 9 is to be formed by using seven digits out of `1, 2, 3, 4 5, 6, 7, 8, 9.` The number of ways in which this can be done is (a) `9!` (b) `2(7!)` (c) `4(7!)` (d) non of these

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