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There is a group of nine children, which includes two pairs of...

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There is a group of nine children, which includes two pairs of... [#permalink]

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Question Stats:

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There is a group of nine children, which includes two pairs of identical twins A,B and C,D. In how many ways can the nine children be seated in a row, so that A and B do not sit next to each other and C and D do not sit next to each other?
A) 44(7!)
B) 28(7!)
C) 5(8!)
D) 6(8!)
E) 4(7!)
[Reveal] Spoiler: OA

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Re: There is a group of nine children, which includes two pairs of... [#permalink]

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New post 14 Oct 2017, 01:21
solution please

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Re: There is a group of nine children, which includes two pairs of...   [#permalink] 14 Oct 2017, 01:21
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There is a group of nine children, which includes two pairs of...

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