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How many four-digit numbers are there, such that consecutive digits are different?

 
9 × 103
9 × 8 × 7 × 6
9 × 9 × 9 × 9
9 × 9 × 8 × 7
None of these

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D should be the answer as the consecutive numbers must be different as stated in the question.

No its correct, c

D