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If the system of equations 2x + λ y + 3z = 5 3x + 2y – z = 7 4x + 5y + μ z = 9 has infinitely many solutions, then ( λ 2 + μ 2 ) is equal to :

1. 30
2. 18
3. 26
4. 22

Correct answer: 26

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