(A) 3/7
(B) 5/12
(C) 27/70
(D) 2/7
(E) 9/35

Additional GMAT Combinatorics/Grouping Practice Questions
Here’s another grouping question from the GMAT Official Guide: A researcher plans to identify each participant in an experiment
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(A) 3/7
(B) 5/12
(C) 27/70
(D) 2/7
(E) 9/35

Here’s another grouping question from the GMAT Official Guide: A researcher plans to identify each participant in an experiment