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In order to gain access to a private web site, each person must have his or her own
Chapter 9, Problem 2(choose chapter or problem)
QUESTION:
In order to gain access to a private web site, each person must have his or her own 6-digit password, where some digit is used 3 times and the remaining 3 digits are distinct. How many such passwords are there?
Questions & Answers
QUESTION:
In order to gain access to a private web site, each person must have his or her own 6-digit password, where some digit is used 3 times and the remaining 3 digits are distinct. How many such passwords are there?
ANSWER:Step 1 of 2
Consider the binomial theorem,
For every nonnegative integer n. In this equationrepresents (r+1)th term