From a group of 8 volunteers, including Andrew and Karen, 4 people are to be selected at random to organize a charity event. What is the probability that Andrew will be among the 4 volunteers selected and Karen will not?

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

from a group of 8 volunteers, including andrew and karen, 4 people are to be selected at random to organize a charity event

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

And another grouping question from GMAT Question of the day

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