GRE Exam Numerical Ability Permutation and Combination

What is the difference between the number of 4 member committees that can be formed from a group of 8 members and the total number of ways there are to arrange the members of such a committee ? (A)1720 (B)1610 (C)1390 (D) 1680

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ans is d. 8p4=8*7*6*5=1680
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GRE Other Question

If bc≠0 and 3b+2c=18, then which of the following is NOT a possible value of c ? (A)9 (B)6 (C)8/5 (D)3/7 (E)5/8 If x is a positive integer greater than 1. Which of the following has the greater value ? (A) 1/(x+1) (B) 1/x (C) x/[1/(x+1)] (D)x/(x+1) (E) x/[x/(x+1)]