How many 3 digit number can be formed by using the digits 1 to 9 if no digit is repeated.
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Step-by-step explanation:
3-digit numbers are to be formed
Three places are to be filled with digits 1 to 9
This can be done in 9×8×7=504 ways
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- 3-digit numbers are to be formed
- Three places are to be filled with digits 1 to 9
- This can be done in 9×8×7=504 ways
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