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The set of all values of lambda for whic...

The set of all values of `lambda` for which the system of linear equations: `x-2y-2z=lambdax`, `x+2y+z=lambday` and `-x-y=lambdaz` has a non-trivial solution:
(a) is an empty sheet
(b) is a singleton
(c) contains more than two elements
(d) contains exactly two elements

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