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Q.

The number of 4-digit numbers with distinct digits is

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a

4634

b

5040

c

504

d

4536

answer is B.

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Detailed Solution

Number of ways to fill thousand’s place = 9

Number of ways to fill hundred’s place = 9

Number of ways to fill ten’s place = 8

Number of ways to fill unit place = 7

∴ 9×9×8×7=4536

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