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Question

If l subscript 1 end subscript superscript 2 end superscript plus m subscript 1 end subscript superscript 2 end superscript plus n subscript 1 end subscript superscript 2 end superscript equals 1 comma etc., and l subscript 1 end subscript l 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 equals 0 comma etc. and capital delta equals open vertical bar table row cell l subscript 1 end subscript end cell cell m subscript 1 end subscript end cell cell n subscript 1 end subscript end cell row cell l subscript 2 end subscript end cell cell m subscript 2 end subscript end cell cell n subscript 2 end subscript end cell row cell l subscript 3 end subscript end cell cell m subscript 3 end subscript end cell cell n subscript 3 end subscript end cell end table close vertical bar then

  1. open vertical bar capital delta close vertical bar equals 3    
  2. open vertical bar capital delta close vertical bar equals 2    
  3. open vertical bar capital delta close vertical bar equals 1    
  4. open vertical bar capital delta close vertical bar equals 0    

The correct answer is: open vertical bar capital delta close vertical bar equals 1

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