Mathematics
Algebra
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Question

text  The total number of matrices   end text A equals open parentheses table attributes columnalign center center center columnspacing 1em rowspacing 4 pt end attributes row 0 cell 2 y end cell 1 row cell 2 x end cell y cell negative 1 end cell row cell 2 x end cell cell negative y end cell 1 end table close parentheses comma left parenthesis x comma y element of R comma x not equal to y right parenthesis space text  for which   end text straight A to the power of straight T straight A equals 3 straight I subscript 3 is colon

  1. 2
  2. 4
  3. 3
  4. 6

The correct answer is: 4

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text  Some identical balls are arranged in rows to form an equilateral triangle. The first row consists of one ball,  end text
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