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GMAT Club Tests | Re: M11-30

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ank4u wrote:

from 1) its only saying half of computers with built in modems do not have infrared ports. how its conveying computers with modem are 50%?


(1) Half of the computers that are equipped with built-in modems do not have infrared ports. Look at the double set matrix below:

Image

As you can see we can not get the value of the yellow box. Not sufficient.

To elaborate more on this statement: sincehalf of the
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