document.write( "Question 1103642: A study by the National Park Service revealed that 42% of vacationers going to the Rocky Mountain region visit Banff National Park, 36% visit Yoho National, and 20% visit both.
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Algebra.Com's Answer #718335 by jorel1380(3719)\"\" \"About 
You can put this solution on YOUR website!
42+36-20=58% chance that a vacationer will visiet one of these parks
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