document.write( "Question 351470: A student is required to work exactly 7 problems from a 14-problem exam and must work exactly 3 of the first 4 problems. In how many ways can the seven problems be chosen? \n" ); document.write( "
Algebra.Com's Answer #251468 by sudhanshu_kmr(1152)![]() ![]() You can put this solution on YOUR website! No. of ways to choose 3 of the first 4 problems = 4C3 = 4\r \n" ); document.write( "\n" ); document.write( "now he have to choose 4 from remaining 10 problems. \n" ); document.write( " \n" ); document.write( " so, no. of ways to choose 4 = 10C4 = 210\r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "total no. of ways to choose problems = 4*210 = 840 \r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "Sometimes there may be typing mistake in solution of a problem, so please ignore it. Understand the concept and try the problem yourself. \n" ); document.write( " |