Find (if possible) conditions on a and b so that the following system has (a) n…

Find (if possible) conditions on aa and bb so that the following system has
(a) no solution
(b) one solution
(c) infinitely many solutions
x+y+z=1x+2yz=2x+3y+az=b\begin{array}{l}x+y+z=1\\x+2y-z=2\\x+3y+az=b\end{array}

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