document.write( "Question 842122: in how many ways four books of maths and three books of physics be placed on a shelf so that the books on the same subject are always together?please tell \n" ); document.write( "

Algebra.Com's Answer #507364 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi,
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document.write( "in how many ways four books of maths and three books of physics be placed on a 
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document.write( "shelf so that the books on the same subject are always together?\r
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document.write( "The idea is to think of the books on the same subject as 'one' unit:  ways \n" );
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