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Consider the following system of equations  x + 2 y + z = 1 2  x + 3 y + z = 1 3 x + ay + 2 z = b For some        R w hen which of the following is NOT correct?

1. It has no solution if  = – 1 and    2
2. It has a solution for all   – 1 and  = 2
3. It has no solution for  = 3 and for all    2
4. It has no solution for  = – 1 and for all    R

Correct answer: It has no solution for  = 3 and for all    2

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