Questions
An n-digit number is a positive number with exactly n digits. Nine hundred distinct n-digit numbers
are to be formed using only three digits and The smallest value of for which this is possible is
detailed solution
Correct option is B
The number of n-digit distinct numbers that can be formed using digits 2, 5 and 7 is 3n. We have to find n, so that 3n≥900⇒ 3n−2≥100 ⇒ n−2≥5 ⇒ n≥7Thus, the smallest value of n is 7Similar Questions
The number of integral solutions of is
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