document.write( "Question 1140037: Along a stretch of road, two intersections have traffic lights. Having a red or a green light for the first intersection is equally likely. Having a red light at the second intersection is twice as likely as a green light, if the traffic light is red at the first intersection. What is the probability of having a red light at the first intersection and a green light at the second intersection? \n" ); document.write( "

Algebra.Com's Answer #760490 by ikleyn(52775) $\"\"$ $\"About$

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document.write( "From the condition,\r\n" );
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document.write( "    - the probabilities to have G or R at the first intersection are each equal to  ;\r\n" );
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document.write( "    - if there is R at the first intersection, then the probability to have R at the second intersection is  ,  \r\n" );
document.write( "         while the probability to have G at the second intersection is .\r\n" );
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document.write( "From it, the probability under the question is \r\n" );
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document.write( "     = .      ANSWER\r\n" );
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