document.write( "Question 966388: if 17 is the number of sequence and the next number is 3 what is the first number before 17 thanks \n" ); document.write( "

Algebra.Com's Answer #590639 by Fombitz(32388) $\"\"$ $\"About$

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I assume you mean you have a sequence of three numbers, the first is X, the second is 17 and the third is 3.
\n" ); document.write( "The difference between 3 and 17 is the same as the difference between 17 and X.
\n" ); document.write( " $\"3-17=17-X\"$
\n" ); document.write( " $\"X=34-3\"$
\n" ); document.write( " $\"X=31\"$
\n" ); document.write( "31,17,3
\n" ); document.write( " \n" ); document.write( "

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