An n-digit number is a positive numbe...

An 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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AAKASH INSTITUTE-PERMUTATIONS AND COMBINATIONS -Assignment Section B Objective type questions (One option is correct )

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