Register

How many 7-digit phone numbers can be formed if the first digit cannot be zero and no digit can be repeated

How many 7-digit phone numbers can be formed if the first digit cannot be zero and no digit can be repeated
153k views
0 votes
how many 7-digit phone numbers can be formed if the first digit cannot be zero and no digit can be repeated

User Taglia
by
7.9k points

2 Answers

1 vote
8 * 9 * 8 * 7 * 6 * 5 * 4
User Danypata
by
8.7k points
1 vote
If the first digit can not be 0 or 1, then there are 8 choices for the first digit. The other 6 have no restrictions, so there are 10 choices for each of those. 8⋅1000000
User Jgoeders
by
8.4k points
← Prev Question Next Question →

No related questions found

Ask a Question
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Other Questions

How do you can you solve this problem 37 + y = 87; y =
What is .725 as a fraction
How do you estimate of 4 5/8 X 1/3
A bathtub is being filled with water. After 3 minutes 4/5 of the tub is full. Assuming the rate is constant, how much longer will it take to fill the tub?
i have a field 60m long and 110 wide going to be paved i ordered 660000000cm cubed of cement  how thick must the cement be to cover field
Link Copied!