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 [IIT 1998]

An n-digit number is a positive number with exactly \[n\] digits. Nine

1.	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 [IIT 1998]
A.	6
B.	7
C.	8
D.	9
Answer» C. 8

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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 [IIT 1998]

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