Class 11MathematicsPermutation and CombinationDefinition of permutation, Number of permutations with or without repetition, Conditional permutations
Medium$n$-digit numbers are formed using only three digits $2, 5,$ and $7$. The smallest value of $n$ for which $900$ such distinct numbers can be formed is:
- A$6$
- B$8$
- C$9$
- D$7$
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View SolutionThe number of natural numbers less than $1000$ in which no digit is repeated is
Evaluate $5!$
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