GRE Exam Numerical Ability Permutation and Combination

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

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GRE Other Question

Patrick is building a garden in the shape of an isosceles triangle with one side of 10. If the perimeter of the garden is 32, which of the following is a possible area of the garden ? A)54 B)64 C)48 D)60 E)24 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