Maths-
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Question

If l subscript r end subscript superscript 2 end superscript plus m subscript r end subscript superscript 2 end superscript plus n subscript r end subscript superscript 2 end superscript equals 1 where r = 1, 2, 3 and I subscript 1 end subscript I subscript 2 end subscript plus m subscript 1 end subscript m subscript 2 end subscript plus n subscript 1 end subscript n subscript 2 end subscript= 0 …etc, then, capital delta equals open vertical bar table row cell l subscript 1 end subscript blank m subscript 1 end subscript blank n subscript 1 end subscript end cell row cell I subscript 2 end subscript blank m subscript 2 end subscript blank n subscript 2 end subscript end cell row cell I subscript 3 end subscript blank m subscript 3 end subscript blank n subscript 3 end subscript end cell end table close vertical bar to the power of 2 end exponentis equal to

  1. -1    
  2. 1    
  3. 2    
  4. 3    

The correct answer is: 1


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