Homework Help: Math

Posted by Please Please Help on Monday, March 5, 2012 at 8:54pm.

Using the 9 digits, 1, 2, 3, 4, 5, 6,7, 8 and 9 you can arrange four different digits to form a four-digit number that is NOT divisible by 7. The digits 1238 cannot be arranged to create a four-digit number that is divisible by 7. The digits 1389 also cannot be arranged to form a four-digit number that is divisible by 7. Find one additional set (not 1238 or 1389) of four different digits that is not divisible by 7. Provide the digits to form the smallest four digit value.

Please explain.
Double Thanks to the person who helps me with this one.

Math - bobpursley, Monday, March 5, 2012 at 9:12pm
easy. if you add or subtract 7, or a multiple of 7 to those number, they will not be divisible by 7.

1238-n*7

or 1238+n7. let n=1 ++++ 1245 not divisible by 7

Answer this Question

Related Questions

MATH - Need Answer to the Following Please: Using the 9 digits, 1, 2, 3, 4, 5, ...
Math Help Please - Can you Please explain the answer that I received of 2469? It...
Math - Received answer to the following question from Jishka. (2469) Would you ...
Math Help Please - Would you please explain the steps you used to get the answer...
Math - Need Answer to the Following Please: Using the 9 digits, 1, 2, 3, 4, 5, ...
Math - What do the digits in the number 15 add up to? Answer 1+5=___. Using ...
Math (Reiny) - Regarding my question below, when the question talks about digits...
math. help please!! - Using only the digits 0 an 1, how many different numbers ...
discrete math - How many strings of four decimal digits (Note there are 10 ...
Math - How many different three-digit numbers can be written using digits from ...

For Further Reading

First Name:
School Subject:
Answer: