... 23. A: The product of all the positive divisors of 23 B: The sum of all the positive divisors of 23 The best answer is B. 23 has two divisors, 1 and 23. A = 1 x 23 = 23. B = 1 + 23 = ... greater. 13. A: A + B B: 35 AI: AB = 35 . The best answer is D. From the additional information we can conclude that there are two possible combinations: A =35 , B=1 or A=7, B=5. ... > A The best answer is A. Pick up easy numbers for this one. A=1, B=2 and C =3. A = (1+2 +3) /3 = 2. B = (1+2 +3+ 1)/4 = 1.75 and therefore column B is smaller. 15. A: -(X + Y) – Z B: -(X...