math

posted by .

how many 7 digit numbers can be formed with the numbers 1, 2, 4, 7. (they are in brackets). the question wants two parts. (a) if the numbers can be repeared and (b) if repetation is not allowed

• math -

Any of 4 numbers can be selected 7 times in a row. The answer is 4^7 = 16,384

Similar Questions

1. statistic & probability

How many 5 digit numbers can be formed using the digits 0, 1, 2, 3, 4, 5, 6 if repeition are not allowed. do i use 7P5?
2. math

i asked a question yesterday and i got an answer. my question was how many 7 digit numbers can be formed with the numbers 1,2,4,7 if a) repetation is allowed b) repetation is not allowed i got an answer but i needed 2 answers and im …
3. math

Using only the numbers 8,1,4,7, and 3, if the product of two 2-digit numbers, plus a number, is 3,355, what are the numbers?
4. math

How many 4-digit numbers can be formed using the numbers 5, 6, 7 and 8?
5. Math

How many different numbers can be formed fro the set of seven numbers (1,2,3,4,5,6,7) if a) repitition is allowed b) repitition is not allowed c) repitition is allowed and the tird digit must be different from the second digit?
6. Math

How many 2-digit numbers have two different even numbers and odd numbers?
7. math

three digit numbers are to be formed from digits 0,1,2,3...9 if repetitionis allowed. (a) how many of such numbers can be formed?
8. Math

Given the digits 1,2,5,7,8,9,0 and if repetition are not allowed, answer each of the following: A) how many 3 digit numbers canbve formed that are divisible by 5?
9. Math

If no digit can be used more than once, how many 5-digit numbers can be formed only using the numbers 3,8,1,2,5, and 7?
10. Math

How many 4-digit numbers can be formed using the numbers 4, 5, 6 and 7?

More Similar Questions