The equations x + y + z = 3, x + 2y + 2z = 6 and x + ay + 3z = b have 

1
No solution when a ≠ 3, b is any value 
2
Infinite number of solutions when b  9  
3
Unique solution when a 3, b is any value  
4
Unique solution when a = 3 and b

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