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The total number of six-digit natural nu...

The total number of six-digit natural numbers that can be made with the digits 1, 2, 3, 4, if all digits are to appear in the same number at least once is a. `1560` b. `840` c. `1080` d. `480`

A

740

B

1830

C

1560

D

none of these

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The correct Answer is:
C
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