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Question

If straight A equals open square brackets a subscript i j end subscript close square brackets subscript 2 cross times 2 end subscript where a subscript i j end subscript equals i plus j then A is equal to

  1. open square brackets table attributes columnalign left left columnspacing 1em end attributes row cell 1      1 end cell row cell 2      2 end cell end table close square brackets
  2. open square brackets table attributes columnalign left left columnspacing 1em end attributes row cell 1      2 end cell row cell 1      2 end cell end table close square brackets
  3. open square brackets table attributes columnalign left left columnspacing 1em end attributes row cell 1      2 end cell row cell 3      4 end cell end table close square brackets
  4. open square brackets table attributes columnalign left left columnspacing 1em end attributes row cell 2      3 end cell row cell 3      4 end cell end table close square brackets

The correct answer is: open square brackets table attributes columnalign left left columnspacing 1em end attributes row cell 2      3 end cell row cell 3      4 end cell end table close square brackets


    A equals open square brackets table attributes columnspacing 1em end attributes row cell a subscript 11 a subscript 12 end cell row cell a subscript 21 a open square brackets horizontal ellipsis subscript 22 close end cell end table close square brackets equals open square brackets table attributes columnalign left left columnspacing 1em end attributes row cell 1 plus 1      1 plus 2 end cell row cell 2 plus 1      2 plus 2 end cell end table close square brackets equals open square brackets table attributes columnalign left left columnspacing 1em end attributes row cell 2      3 end cell row cell 3      4 end cell end table close square brackets

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