PT8.S2.Q13 (G3) - Seven children are to be seated...

bailey.emmett10

On the above mentioned section it mentions how many seats two different kids can sit in. By my reasoning Frank can only sit in seats 1 or 3 and Ruby can only sit in seats 2 or 4 so my answer was (B) Two. It says the correct answer is (C) Three. How is it three not two?
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