Sunday, June 14, 2009

Problem 47 - GMAT Combinatorics

In how many ways can five girls stand in line if Maggie and Lisa cannot stand next to each other?

(A) 112
(B) 96
(C) 84
(D) 72
(E) 60
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1 comment:

  1. Vikram SikandMarch 9, 2010 at 9:01 AM

    5!-2x(4!)=72
    ML can be considered one block-hence number of arrangements = 2x4! (M and L can be L and M)
    Total number of arrangements 5!

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