SOLUTION: A seven digit phone number consists of a three-digit prefix followed by four digits. How many different phone numbers are possible for a particular prefix?

Question 130512This question is from textbook Saxon Math course 1
: A seven digit phone number consists of a three-digit prefix followed by four digits. How many different phone numbers are possible for a particular prefix? This question is from textbook Saxon Math course 1

Found 2 solutions by edjones, extrella:
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
How many ways can 10 numbers be arranged 4 at a time? Duplication is allowed and order of the numbers is important.
10^4 Ans.
.
Ed

Answer by extrella(1) (Show Source): You can put this solution on YOUR website!
C(7,3) = 35
C(7,4) =35
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