nine hundred distinct `n`digit numbers are to be formed using only the three digit `2,5,7` . the smallest value of `n` for which is possible

nine hundred distinct ndigit numbers are to be formed using only the three digit 2,5,7 .the smallest value of n for which is possible

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 is possible is

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

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 :

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 a. 6 b. 7 c. 8 d. 9

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 a. 6 b. 7 c. 8 d. 9

An n-digit number is a positive number with exactly n digit 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 (a) 6 (b) 7 (c) 8 (d) 9