[" The real value of 'a' for which the "...

[" The real value of 'a' for which the "],[" equations "ax+y+z=0,-x+ay+z=0" ,"],[-x-y+az=0" have non-zero solution is "],[[" 1) "1," 2) "0," 3) "-1," 4) all the above "]]

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