Math
posted by marco .
Confused on permutation or combination on this question:
A VISA credit card has a first digit of 4 followed by 15 other digits. How many different VISA accounts does this allow?
I know the formulas but I am having a hard time determining which one to use. Help!!!

We have a choice of 10 digits at each of the following digits, so the total number of choices is
10^(15).
In real life, the last digit (16th) is used for validation purposes, and is not a free choice. There number of "free" digits is therefore limited to 14. But that's not part of the math question. 
Thank you!
Respond to this Question
Similar Questions

Math 156
I already did the first and third question I just need some one to make it clear to me what he is asking for question 2. Hint anyone please thanks. What is the difference between a combination and a permutation? 
math
A chartered bank is raising the interest rate on its Visa credit card from 9% to 11%. What will be the percent increase in the interest charges on a given balance? 
Credit Cards
What are some credit card names? Such as Master Card and VISA. I need to know three more. Thanks 
Math (Reiny)
Regarding my question below, when the question talks about digits 07 do we include the 0. In other words, are the possible digits 0,1,2,3,4,5,6,7 or 1,2,3,4,5,6,7? 
business
Research the VISA website. After reviewing of all the documents you can find on the web and in libraries, write a 3page response to the following questions: 1.What is the most important problem facing VISA? 
Marketing
1. Recently American Express, Visa and MasterCard have been pushing hard into the smallticket end of the credit card market. The purchase of items such as fast food meals, and movie popcorn and candy have been targeted as growth areas … 
Algebra
Guess the 4digit combination. An X stands for a correct digit in its correct place in the combination and an O stands for a correct digit out of its corect order. 8256 OX Two of the four digits 8,2,5,6 appear in the final combination(one … 
statistics
The First National Bank of Wilson has 680 checking account customers. A recent sample of 60 of these customers showed 32 to have a Visa card with the bank. Construct the 98 percent confidence interval for the proportion of checking … 
Accounting
The following is an excerpt from a conversation between the office manager, Mark Cottman and the president of Horowitz Construction Supplies, Co., Rosa Mullin. Horowitz sells building supplies to local contractors. Mark: Rosa, we’re … 
Algebra
2. Which is not a combination? choosing 3 toppings for your pizza lining 3 students up in a row choosing 2 desserts from a tray of 10  Choosing 5 students to represent a class of 30 3. How many ways can you choose 3 dishes from