Class 11MathematicsPermutation and CombinationDefinition of permutation, Number of permutations with or without repetition, Conditional permutations
Easy$A$ lock is made with $3$ rings,each marked with $10$ different letters. How many unsuccessful attempts can be made to open the lock?
- A$3^{10} - 1$
- B$9^3$
- C$^{10}P_3 - 1$
- D$10^3 - 1$
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