document.write( "Question 634655: In sequence 3, 7, 11, 15, 19..., find S(sub 50). If S(sub 0)= 3\r
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Algebra.Com's Answer #399769 by ewatrrr(24785)\"\" \"About 
You can put this solution on YOUR website!
 
\n" ); document.write( "Hi,
\n" ); document.write( "Re TY, one may use either of the 2 formulas*** to find the sum
\n" ); document.write( "3, 7, 11, 15, 19..., Arithmetic sequence, d = 4
\n" ); document.write( "For sums of an arithmetic sequence one can use:
\n" ); document.write( "***\"S%5Bn%5D=%28n%2F2%29%282%2Aa%5B1%5D%2B+%28n-1%29d%29\" OR
\n" ); document.write( "***\"S%5Bn%5D+=+n%28a%5B1%5D+%2B+a%5Bn%5D%29%2F2\"\r
\n" ); document.write( "\n" ); document.write( "\"S%5B50%5D+=+50%28+3+%2B+a%5B50%5D%29%2F2\" |Using the Latter after finding \"a%5B50%5D\"
\n" ); document.write( "\"a%5Bn%5D+=+a%5B1%5D+%2B+%28n-1%29d\"\"a%5B50%5D+=+3+%2B+49%2A4+=+199\"
\n" ); document.write( "\"S%5B50%5D+=+highlight%2850%29%2A%283+%2B+199%29%2F2+=+50%2A101+=+5050\" \n" ); document.write( "
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