GRE Exam Numerical Ability Area and Volume

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

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GRE Other Question

Warren can take 4 friends with him on a vacation and is listing the possible combinations of friends. If he has 6 friends to choose from and is numbering each possible combination sequentially beginning with 1, then which of the number/numbers will appear on his list of combinations ? A) 4 B) 9 C) 12 D) 16 E) 18 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