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JEE MATHEMATICS MCQ: PERMUTATIONS

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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

View answer and explanation

Correct option: B

7

Option B (7) is correct because it is the smallest number of digits needed to form at least 900 distinct numbers using only the digits 2, 5, and 7.

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