Class 11MathematicsPermutations and CombinationsDefinition of permutation, Number of permutations with or without repetition, Conditional permutations
EasyHow many $4$-digit numbers can be formed by using the digits $1$ to $9$ if repetition of digits is not allowed?
- A$3024$
- B$3025$
- C$3026$
- D$3027$
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