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

An n- digit number is a positive number with exctly n digits nine hundred distinct n - digit numbers are to be formed using only 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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The correct Answer is:
B
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DIPTI PUBLICATION ( AP EAMET)-PERMUTATIONS & COMBINATIONS-EXERCISE 1A (PERMUTATIONS )
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