Class 11MathematicsPermutation and CombinationDefinition of permutation, Number of permutations with or without repetition, Conditional permutations
Easy$A$ three-digit number $n$ is such that the last two digits are equal and differ from the first digit. The number of such $n$'s is:
- A$64$
- B$72$
- C$81$
- D$900$
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