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Let S be the set of all real values of λ such that a plane passing through the points (– λ 2 , 1, 1), (1, – λ 2 , 1) and (1, 1, – λ 2 ) also passes through the point (–1, –1, 1). Then S is equal to :

1. {1, –1}
2. {3, –3}
3. } 3 {
4. } 3 , 3 { −

Correct answer: } 3 , 3 { −

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