GRE Exam Numerical Ability Probability

What is the probability that a two digit number chosen at random will be a multiple of 3 and not of 5? (A) 1/3 (B) 2/15 (C) 4/15 (D) 2/9 (E) 8/15

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GRE Other Question

When positive integer n is divided by 3, the remainder is 2. When n is divided by 7, the remainder is 5. How many values less than 100 can n take? (A) 0 (B) 2 (C) 3 (D) 4 (E) 5 If ab=x, and a/b=y and ab does not equal zero, then a² − b² = ? (A) x(y-1)(y+1)/y (B) xy - (x/y) (C) x² - y² (D) (y+x)(y-x)/x