A test consists of math xmlns=http://www.w3.org/1998/Math/Math...

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A test consists of math xmlns=http://www.w3.org/1998/Math/MathMLmn6/mn/math multiple choice questions, each having math xmlns=http://www.w3.org/1998/Math/MathMLmn4/mn/math alternative answers of which only one is correct. The number of ways, in which a candidate answers all six questions such that exactly four of the answers are correct, is span style=text-decoration: underline;           /span 
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