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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. none of these

A

9!

B

2(7!)

C

4(7!)

D

None of these

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The correct Answer is:
c
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