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# The figure above represents a system of roads along which traffic flow

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Re: The figure above represents a system of roads along which traffic flow [#permalink]
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Much easier to do this problem by looking at the splits in the route to X and subtracting from 1.

Counting the splits on the way to X shows only 3.

So (1/2)^3= 1/8 gets to X, meaning 7/8 gets to Y

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Re: The figure above represents a system of roads along which traffic flow [#permalink]
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Re: The figure above represents a system of roads along which traffic flow [#permalink]
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