Class 11MathematicsPermutation and CombinationDefinition of permutation, Number of permutations with or without repetition, Conditional permutations
MediumAn $n$-digit number is a positive number with exactly $n$ digits. Nine hundred distinct $n$-digit numbers are to be formed using only the three digits $2, 5$ and $7$. The smallest value of $n$ for which this is possible is
- A$6$
- B$7$
- C$8$
- D$9$
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