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Solve ques 3 Q.3. n-digit numbers are formed using only three digits 2, 5 and 7. The smallest value of n for which 900 such distinct numbers can be formed, is (A) 6 (B) 7 (C) 8 (D) 9
E.g: 9876543210, 01112345678
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Syllabus
Solve ques 3
Q.3. n-digit numbers are formed using only three digits 2, 5 and 7. The smallest value of n for which 900 such distinct numbers can be formed, is
(A) 6
(B) 7
(C) 8
(D) 9
please answer it quickly