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What is the number of four-digit decimal numbers `(lt 1)` in which no digit is repeated ?

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What is the number of four-digit decimal numbers `(lt 1)` in which no digit is repeated ?
A. 3024
B. 4536
C. 5040
D. None of the above
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Correct Answer - B
Let the given 4 digit decimal number is image
Places after decimal can be filled in the following ways: image
Total number of ways `= 7 xx 8 xx 9 xx 9 = 4536`
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