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If the equation of the plane containing the line x + 2y + 3z – 4 = 0 = 2x + y – z + 5 and perpendicular to the plane ) k 3 j ˆ 2 i ˆ ( ) k j ˆ i ˆ ( ) j ˆ i ˆ ( r + − μ + + + λ + − = r is ax + by + cz = 4, then (a – b + c) is equal to

1. 18
2. 22
3. 20
4. 24

Correct answer: 22

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