मान लीजिए यदि समीकरण निकाय x + 2y + 3z = 5, 2x + 3y + z = 9, 4x + 3y + λz = μ के अनंत हल हों, तो λ + 2μ बराबर है:

1
28
2
17
3
22
4
15

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