math

posted by .

how many 7 digit telephone numbers can be made if every other digit is even

• math -

Not sure if the 7 digit can start with a zero, looked at my phone book and couldn't find any

could be
EOEOEOEOE , assuming the 0 with the evens
number = 4x5x5x5x5x5x5 = 4x5^6 = 62500

or could be
OEOEOEO
number = 5^7 = 78125

for a total of 140625

Similar Questions

1. math

The number uses every number 0-9 the numbers are used only once the fourth digit is 4 the first digit in the billions place is 3 the 5 is next to the last digit the sixth digit is 7 the digit after 3 is 9 the digit before 5 is 2the …
2. Math. Explain

From the digits 1, 2, 3, and 4, how many positive integers are less than 100,000?
3. Math

Tami wrote the even numbers between 325 and 337. The sum of the hundreds digit and tens digit equals the ones digit. What is Tamis number?
4. math

It is 7 digit even number.There is no repetition of digits. The digit 5 is in thousands place. The greatest digit is in thee millions place. the digit in the hundred thousandsplace twice the digit in the hundreds place.The digit in …
5. math

the hundred thousands digit of a six-digit even numbers is 3 more than the thousand digit,which is twice the ones digit.give at least four numbers that satisfy the given condition.
6. Camansi National High School

Math In a 3 digit number the hundreds digit is one half of tens digit while the ones digit is more than the tens digit. If the sum of 3 digit is 11, find the numbers.
7. Math

It's a riddle question. All six digits in the number even remember that zero is an even number one digit is use once and all the other digits is used twice is four times the hundreds digit 10 digit is the difference of the ones digit …
8. Math

It's a riddle question. All six digits in the number even remember that zero is an even number one digit is use once and all the other digits is used twice is four times the hundreds digit 10 digit is the difference of the ones digit …
9. Math

A 2 digit even number is divided by 5. The quotient is a 1 digit even number. What are all the 2 digit numbers that fit this description ?
10. math

the hundred thousand digit of a six digit even number is 3 more than the thousand digit which is twice the ones digit .give atleast four numbers that satisfy the given condition

More Similar Questions