document.write( "Question 131724: If each pupil in a class sends a New Year card to every classmate , the total number of cards sent out will be 870 . Find number of pupils in the class ? Pls Help \n" ); document.write( "

Algebra.Com's Answer #96167 by checkley71(8403) $\"\"$ $\"About$

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THE FORMULA FOR THIS PROBLEM IS:
\n" ); document.write( " N(N-1)=870
\n" ); document.write( "N^2-N-870=0
\n" ); document.write( "(N-30)(N+29)=0
\n" ); document.write( "N-30=0
\n" ); document.write( "N=30 ANSWER FOR THE NUMBER OF CLASSMATES. \n" ); document.write( "

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