1. Which of the following is not a prime factor of 390?   2   3   5   7   13   Hint Half-n-half Clue   2. The sum of the product and quotient of 9 and 9 is   1   18   28   81   82   Half-n-half Clue   3. Which of the following is not a prime?   43   53   63   73   83   Half-n-half Clue   4. A three-digit number has 8 as its last digit. The first digit is thrice the second digit, and the difference between the last two digits is 5. The number is   358   398   839   893   938   Half-n-half Clue   5. 24 students are to be seated in rows parallel to the front of the classroom. There must be more than two rows, and more than two students in each row. If each row must have the same number of students, then the number of different arrangements possible is   4   5   6   7   8   Half-n-half Clue   6. If a is a positive integer, which of the following is not defined?   0 divided by a   a divided by 0   a multiplied by 0   a multiplied by 1   a divided by 1   Half-n-half Clue   7. Which of these is not a divisor (factor) of 112?   7   8   12   14   28   Half-n-half Clue