An n -digit number is a positive number with exactly n digits. Nine hundred distinct n…
Mathematics · JEE Advanced · NTA Exams — Permutations and Combinations
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
- 6
- 7
- 8
- 9
Answer
(B) 7
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