Posted by **student** on Friday, July 6, 2007 at 1:27am.

can someone correct this for me parts A-E and if i am wrong can you help me....please

How many 7-digit telephone numbers are possible if the first digit cannot be zero and.....

a) only odd digits may be used?

my answer: 8125

b) the telephone number must be multiple of 10(that is , it must end in zero)?

my answer: 1,000,000

c) the telephone number must be a multiple of 100?

my answer 100,000

d) the first 3 digits are 481?

my answer 10,000

e) no repetitions are allowd?

my answer: 120

I will be happy to critique your work.

## Answer this Question

## Related Questions

- math,correction, bobpursly - Since when is 5^7 =8125? if a number is a multple ...
- Math. Explain - From the digits 1, 2, 3, and 4, how many positive integers are ...
- math - The number uses every number 0-9 the numbers are used only once the ...
- algebra 2 - how many 7-digit phone numbers are possible if the first digit must ...
- MATH Trouble - I have no idea what this problem means: For how many two-digit ...
- MATH ( PROBABILITY) - Security codes in Fiji are made up of 4 digits. How many ...
- math - this code has five digit 1,2,3,4,5. the first digit plus the second digit...
- Algebra 1:Problem Solving - How many different seven-digit telephone numbers are...
- math - use the clues to find the 7th digit mystery number. * Its is between 1 ...
- math - i have a six digit question my 100 thousands is one less than my ones ...