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The set of all values of λ for which the system of linear equations : 2x 1 – 2x 2 + x 3 = λ x 1 2x 1 – 3x 2 + 2x 3 = λ x 2 –x 1 + 2x 2 = λ x 3 has a non-trivial solution,

1. is an empty set
2. is a singleton
3. contains two elements
4. contains more than two elements

Correct answer: contains two elements

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