Question

an n digit number is a positive number with exactly n digits. 900 distinct n digit numbers are to be formed using only 3 digits 2,5,7. then the smallest. value of n for which this is possible

Answer 1

Everyone can be possible by different methods

Answer 2

Answer:

Solution: Total number of n digits numbers formed using three digits = 3n

As per the given condition,

3n = 900

3n-2 = 100

n-2=5

n=7