Quick Questions. True or False
1. is 9 a factor of 777,777
2. 3 is not a factor of 12,345
3. 245+712 is a multiple of 5
4. 3a+15b is divisible by 3 for any values of a and b
5. 11 is not a factor of 11^3
6. 555 is divisible by 3 but not by 9
7. 2772 is a multiple of 9 but not of 3