How many numbers between 10 and 10,000 can be formed by using the digits 1,2,3,4,5 if no digit is repeated in any number.
A
100
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B
200
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C
10
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D
20
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Solution
The correct option is A200 Number of two digit numbers =5×4=20 Number of three digit numbers =5×4×3=60 Number of four digit numbers =5×4×3×2=120 Total =200