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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