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Can anyone help me with #47? I understand why the answer key's answer is correct, but my approach was to figure out the probability that one secretary gets no reports (16/27) and the probability that two secretaries get no reports (1/27) and subtract those probabilities from 1, and the result is dif...

by ga1ex

Sun Aug 19, 2012 9:17 pm
Forum: GMAT Math
Topic: Probability and Combination Problems
Replies: 16
Views: 47779

regarding question #32 The answer 170 is not correct in my opinion. it should be 171 the suggested solution is not considering the diagonal between the two neighbors of the un-attached vertex. The calculation should be the complete graph on 21 vertices and then remove 18 vertices : 1/2*(21*18)-18=1...

by ga1ex

Fri Aug 17, 2012 11:35 pm
Forum: GMAT Math
Topic: Probability and Combination Problems
Replies: 16
Views: 47779

This problem set is super helpful - thanks for posting. I think I've found some more incorrect answers: #37. The answer doesn't take into account the possibility of the second and third digits being the same. I think the right answer is C. #41. The answer takes into account the possibility of the fi...

by ga1ex

Fri Aug 17, 2012 10:39 pm
Forum: GMAT Math
Topic: Probability and Combination Problems
Replies: 16
Views: 47779