GRE Exam Numerical Ability Permutation and Combination

Given an alphabet of 26 letters with 21 consonants and 5 vowels, how many three-letter words can be formed with a vowel as the first letter and a consonant as the last letter ? A) 1560 B) 2730 C) 2205 D) 3380

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GRE Other Question
How much greater , in square inches, is the area of a square with a diagonal of 8 inches than the area of a square with a diagonal of 4 inches ? A) 20 B) 24 C) 36 D) 48 If p is a negative even integer and pq is a negative odd integer, then q must be: A) Positive even integer B) Negative even integer C) Positive fraction D) Negative fraction E) None of these