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How many 4-digit numbers with all different digits can be formed from 0 to 9?
A5040
B9000
C4536
D3024
Answer & Solution
Correct answer: C. 4536
The first digit cannot be 0, giving 9 choices, then 9, 8 and 7 for the others: 9 x 9 x 8 x 7 = 4536.
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