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JEE MAIN 2020
04-09-2020 S1
Question
If the system of equations $$ \begin{aligned} & x-2 y+3 z=9 \\ & 2 x+y+z=b \end{aligned} $$ $x-7 y+a z=24$, has infinitely many solutions, then $a-b$ is equal to $\_\_\_\_$ .
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