document.write( "Question 604635: What is the difference between 200th and 300th term of the sequence 1,3,7,15.....?and how to solve it \n" ); document.write( "
Algebra.Com's Answer #381344 by scott8148(6628)\"\" \"About 
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the differences between terms is doubling, so a power of 2 is involved\r
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\n" ); document.write( "\n" ); document.write( "where n is the number of the term, Tn = (2^n) - 1
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