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Syllabus

PLEASE SOLVE IT ALONG WITH EXPLANATIONSolve 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