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JEE MATHEMATICS MCQ: PERMUTATIONS

1 Easy

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Nine hundred distinct

\mathrm{n}

-digit number

\mathrm{s}

are to be forme using exactly the three digits. 2, 5 and 7 . The smallest value  of

\mathrm{n}

for which this is possible is.

View answer and explanation

Correct option: A

7

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

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