document.write( "Question 429619: there are 90 students , 60 play clarinet and 40 play the trombone, 10 only play the trombone. find the probability of a student playing the trombone or the clarinet. \n" ); document.write( "

Algebra.Com's Answer #298401 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi
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document.write( "there are 90 students , 60 play clarinet and 40 play the trombone, 
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document.write( "10 only play the trombone: that is 30 play both.
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document.write( "P(trombone or clarinet) = 40/90 + 60/90 - 30/90 = 70/90 = 7/9\r
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document.write( "P(A or B) = P(A) + P(B) - P(A and B) \n" );
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