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Q.

The number of 4-digit numbers with distinct digits is

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a

504

b

4536

c

4634

d

5040

answer is B.

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Detailed Solution

Number of ways to fill thousand’s place = 9Number of ways to fill hundred’s place = 9Number of ways to fill ten’s place = 8Number of ways to fill unit place = 7∴ 9×9×8×7=4536

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