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If the system of equations 2x+3y=7,\ \...

If the system of equations `2x+3y=7,\ \ \ 2a x+(a+b)y=28` has infinitely many solutions, then (a)`a=2b` (b) `b=2a` (c) `a+2b=0` (d) `2a+b=0`

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RD SHARMA-PAIR OF LINEAR EQUATIONS IN TWO VARIABLES-All Questions
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